A member of Congress who wants to act on what the majority of his or her constituency thinks on a particular issue would be advised to respond to which of the following indicators?

A. letters from constituents
B. the editorial positions of newspapers in the country
C. PUBLIC DEMONSTRATIONS BY THE CONSTITUENTS
D. a poll based on random sample of constituents
E. THE NUMBER OF YARD SIGNS ON MAJOR STREETS

To determine the answer to this question, you should consider which indicators would accurately represent the majority opinion of a member of Congress's constituency.

Option A: Letters from constituents - This can be a useful indicator as it provides direct feedback from individual constituents. However, it may not necessarily represent the majority opinion, as people who take the time to write letters may have strong opinions that are not reflective of the broader population.

Option B: Editorial positions of newspapers - While newspapers can influence public opinion, they may not accurately reflect the sentiments of the majority of constituents. Editorial positions can vary across different newspapers, and not all constituents may read or be influenced by newspapers.

Option C: Public demonstrations by constituents - Public demonstrations can be an indicator of strong public sentiment, but they may not necessarily represent the majority opinion. Demonstrations are often led by passionate individuals or interest groups, and they may not reflect the broader population.

Option D: A poll based on a random sample of constituents - This is a reliable method to gauge public opinion. Conducting a poll with a random sample of constituents can provide a more accurate representation of the majority opinion. Random sampling helps to ensure that the results are not skewed by any particular group or bias.

Option E: The number of yard signs on major streets - This indicator is subjective and may not accurately represent the majority opinion. The number of yard signs is often influenced by factors such as availability, funding, and willingness to display signs, rather than reflecting the sentiment of the majority.

In conclusion, option D - a poll based on a random sample of constituents - would be the most advisable indicator for a member of Congress who wants to act on the majority opinion of their constituency. This method best mitigates potential biases and provides a more accurate representation of the broader population's views.