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B 101 is a prime number.

Explanation:101 is a prime number since it has only two factors i.e. 1 and 101 itself. Since it has exactly two factors, it satisfies the definition of prime numbers. To recall, a prime number is a positive whole number which has exactly two factors or divisors.

b or c ( this is because my answer is short so just ignore it)

answer; the period of time known as the middle ages;