Critical Reasoning

Two centuries ago, Tufe Peninsula became separated form the mainland, isolating on the newly formed Tufe Island a population of Turfil sunflowers. This population’s descendants grow to be, on average, 40 centimeters shorter than Turfil sunflowers found on the mainland. Tufe Island is significantly drier than Tufe Peninsula was. So the current average height of Tufe’s Turfil sunflowers is undoubtedly at least partially attributable to changes in Tufe’s environmental conditions.

Which of the following is an assumption on which the argument depends?

A. There are no types of vegetation on Tufe Island that are known to benefit from dry conditions.

B. There were about as many Turfil sunflowers on Tufe Peninsula two centuries ago as there are on Tufe Island today.

C. The mainland’s environment has not changed in ways that have resulted in Turfil sunflowers on the mainland growing to be 40 centimeters taller than they did two centuries ago.

D. The soil on Tufe Island, unlike that on the mainland, lacks important nutrients that help Turfil sunflowers survive and grow tall in a dry environment.

E. The 40-centimeter height difference between the Turfil sunflowers on Tufe Island and those on the mainland is the only difference between the two population

Is it C?

C for me as well.

Pardon my ignorance but what is this PDF800 set that you are posting from?

The PDF800 is a kind of test which represents (It's my point of view) the real level of difficulty of the Gmat.
On the content, you'll find the least level of difficulty and the level for 700+.

I attache an example. If you want some stuff, send a private message.

should be C

The reasoning elaborates as why the Turfil sunflowers flowers are shorter on the Island assuming that earlier the flowers had been taller earlier.

I also think that answer should be C.