The president's role in foreign policy increased largely because:

a Congress proved so inept in foreign affairs that the american people demanded a change
b America became more of a world poer
c of the need to coordinate national economic poicy and foreign policy, a task to which the presidency was well-suited
d of the desire of US business to expland into Latin America and Asia, which required executive action at the highest level
I think C is the answer

I agree.

To determine the correct answer, let's break down the options and analyze them:

a) Congress proved so inept in foreign affairs that the American people demanded a change: This option suggests that the president's role in foreign policy increased because Congress was ineffective in handling foreign affairs. While Congress does play a role in foreign policy, the primary responsibility for foreign policy lies with the executive branch, specifically the president. However, this option does not fully explain the increase in the president's role, so it is unlikely to be the correct answer.

b) America became more of a world power: This option suggests that as America gained more influence and became a significant global power, the president's role in foreign policy increased. It is true that as a country's global influence expands, the president's role in foreign policy generally becomes more prominent. Therefore, this option is a possible explanation.

c) The need to coordinate national economic policy and foreign policy, a task to which the presidency was well-suited: This option suggests that the president's role in foreign policy increased due to the requirement of synchronizing national economic policy with foreign policy, a task well-suited for the presidency. This option emphasizes the importance of the president's role in aligning economic interests with foreign policy objectives. Hence, this option is a reasonable explanation.

d) The desire of US business to expand into Latin America and Asia, which required executive action at the highest level: This option suggests that the president's role in foreign policy increased because U.S. businesses wanted to expand into Latin America and Asia, necessitating executive actions at the highest level. While economic interests can influence foreign policy decisions, it is unlikely that this factor alone significantly increased the president's role. Therefore, this option is less likely to be the correct answer.

Based on the analysis, both options (b) and (c) appear to be reasonable explanations for why the president's role in foreign policy increased. However, option (c) seems to provide a broader and more comprehensive explanation, highlighting the need for coordinated national economic policy and foreign policy, which aligns with the complexities of the presidency. Therefore, option (c) is likely the correct answer.