'Preliminary SAT (PSAT) Practice Test 2025 – The Complete Guide to Achieve Exam Success!'

The word "affect" is the correct answer because it functions as a verb that means to influence or make a change in something. For example, you might say that the weather can affect your mood, indicating that the weather has an influence on how you feel.

On the other hand, "effect" is primarily used as a noun that refers to the result or outcome of a change or influence. For instance, you might talk about the effect of a new policy on the economy. Therefore, understanding the difference between these two words is essential, especially in distinguishing their grammatical roles in sentences.