The meaning that is closest to the meaning of the underlined word "precursor" is preceding requirement. (option B)
Meaning of "precursor"
The word "precursor" means antecedent or predecessor, that is, it refers to something that comes before something else. However, even if we did not know its meaning, we could have guessed it through the context.
If you need to learn algebra before learning calculus because the former will help with the latter, that means algebra is a preceding requirement. In other words, algebra is a requirement that comes first, before calculus.
With that in mind, we can select option B as the best answer for this question.
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