(C)Her whining gave me a major headache.
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D because if a president is telling what his plan is, then he would also have to have dates and times for each part of his plan.
The three answers you should mark are: trips from one coast to the other took too much time to complete, it was difficult and dangerous to travel long distance by boat or by horse, and companies had no way to transport goods from one coast to another.
Basically the first and second, and forth you should mark.