Question

The findings of the survey ________ the researcher’s theory. *

Answer 1

is the researchers theory

Answer 2

This question is based on phrasal verbs.

Cambridge English Dictionary defines "phrasal verbs" as "a phrase that consists of a verb with a preposition or adverb or both, the meaning of which is different from the meaning of its separate parts."

MacMillan Dictionary defines "turned against" as "[turn against someone/something] to stop liking or supporting someone or something and to start opposing them."

So, the correct sentence is :

The findings of the survey turned against the researcher’s theory.