__________ হ'ল যুগ্ম মৌলিক সংখ্যা। A. (4, 9) B. (2, 3) C. (4, 6) D. (3, 5)

Twin primes are pairs of prime numbers that differ by 2, such as (3, 5), (5, 7) and (11, 13). (2, 3) differ by 1, and 4, 6 and 9 are not prime.