Where was the Panama Canal supposed to be built and why did it not build there? And what are the effects of it?

Nicaragua

Explanation:

America originally wanted to build a canal in Nicaragua, not Panama. Throughout the 1800s, the United States, which wanted a canal linking the Atlantic and Pacific for economic and military reasons, considered Nicaragua a more feasible location than Panama.More than a century ago, the opening of the Panama Canal revolutionized international trade by making it much quicker and easier to travel between the Atlantic and Pacific Oceans.

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a is your answer!

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.