The correct answer is option B. The sentence which uses affect correctly is - "Omar's work in the laboratory proved the affect he had theorized."
The definition of the verb affect is to act on or make a change in. Effect, which means outcome or consequence, is most frequently employed as a noun. Instead of causing something, the verb affect is nearly always used to refer to influencing someone or something. Effect is typically referred to as a noun. It alludes to a happening or an object. When discussing an outcome, it is frequently used.
Option B is the best suitable answer because in the sentence it can be seen that Omar's work in laboratory has correctly proved the affect he wanted to theorize. The change or influence he wanted to bring out by his theory was proven correct.
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