In its initial dealings with Colombia over the Panama Canal, the United States proposed all of the following except

a) a six-mile-wide zone;
b) a ten-year, non-renewable lease that would then turn control of the canal over to Colombia;
c) a yearly payment of $250,000;
d) a cash payment of $10 million;

I think it is B

I believe you're right.

http://www.negotiations.com/case/canal-route/

its b

To identify which option the United States did not propose in its initial dealings with Colombia over the Panama Canal, we need to evaluate each of the given options.

a) The United States proposed a six-mile-wide zone. This was part of their proposal for the Panama Canal.

b) The United States proposed a ten-year, non-renewable lease that would then turn control of the canal over to Colombia. This was also part of their initial proposal.

c) The United States proposed a yearly payment of $250,000. This financial arrangement was part of their offer.

d) The United States proposed a cash payment of $10 million. This was a part of their proposal as well.

Based on the evaluations above, option B is not correct because it was part of the United States' initial proposal to Colombia for the Panama Canal. Therefore, the correct answer is not B.