Which one of the following must be true?

colleenmcclain on September 4, 2022

It seems like answer choice A and B are saying the same thing. What's the difference?

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Emil-Kunkin on September 6, 2022

Hi Colleen,

A tells us that the first irrigated crop is not P, while B tells us that there is at least one irrigated crop before P. These do indeed look quite similar, however, there is one difference.

A simply tells us that the first irrigated crop is not P, which makes sense since If P is irrigated, it must be third.

B tells us that there must be an irrigated crop before P, but this is not necessarily true. It is possible that P is fertilized rather than irrigated- in which case P could actually be first.