Which of the following is arranged in decreasing order of extension (from the widest to the narrowest)?

AMathematics, Arithmetic, Numbers/Digits, Prime Numbers ✓ Correct

BPrime Numbers, Numbers/Digits, Arithmetic, Mathematics

CArithmetic, Mathematics, Numbers/Digits, Prime Numbers

DNumbers/Digits, Prime Numbers, Arithmetic, Mathematics

Correct answer: (A) Mathematics, Arithmetic, Numbers/Digits, Prime Numbers

Explanation

The order mathematics, arithmetic, numbers, prime numbers runs from the widest to the narrowest.

Extension is the sweep of things a term covers.

Mathematics is the broadest field, containing arithmetic among its branches.

Arithmetic in turn deals with numbers, a narrower class.

Prime numbers are only a special part of the numbers, the narrowest here.

Each term nests inside the previous one, so extension steadily decreases.

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