Question

read the sentence.
algebra is a precursor for calculus because it will help students to be successful in the latter course.
which word is closest in meaning to the underlined word?
preceding requirement
complex training
brief introduction
predominant trait

Explanation:

First, we analyze the meaning of "prerequisite" (the underlined word, though not shown, from the context "Algebra is a prerequisite for calculus..."). A prerequisite is something required before another course. "Preceding requirement" means a requirement that comes before, which matches the meaning of prerequisite. "Complex training" is about training complexity, "predominant trait" is a main characteristic, and "brief introduction" is a short overview—none match "prerequisite" as well as "preceding requirement".

Answer:

preceding requirement