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The first thing you need to do is get a graph for the corn. This one is not very good, but it will get you an answer. While the potatoes graph is going from 50000 to 40000 (slowly), the corn  graph is going up like a rocket trajectory. So eventually, the Baker family will produce more corn than potatoes. That's D.

Answer D.

Problems with AB and C
A
The problem with A is that they won't always produce more potatoes than corn. That will happen only in the beginning.

B
Clearly B is wrong. The amount of corn in the beginning was 25000 pound. In the meantime potatoes were produced at a yearly rate of nearly 50000 pounds of potatoes.

C is wrong because of what A says.
 

The answer would be -3.9> -4.5

Not sure what the question is but i hope this x = years100 * x