Lack of wireless telecommunications and quick transportation (12) made long-distance travel, impractical because it took up much time and isolated the president from events in Washington, D.C.

Read the passage underlined (12). There may be a mistake in punctuation, capitalization, or spelling. If you find a mistake choose the answer that corrects the mistake. If there is no mistake, choose ‘Correct as is.’
Responses
A made long-distance travel impractical because, it took up much timemade long-distance travel impractical because, it took up much time
B made long-distance travel impractical because it took up much timemade long-distance travel impractical because it took up much time
C made long-distance travel impractical because it took up, much timemade long-distance travel impractical because it took up, much time
D Correct as is.

D (Correct as is).