Answer:
D
Explanation:
divide by the prime numbers 2, 3, 5, 7 until 1 is reached. The prime factorisation is the product of the prime numbers we have divided by.
Note if a particular value does not divide by a prime, move on to the next prime.
divide 700 by 2
700 ÷ 2 = 350 ← divide by 2 again ⇒ 2
350 ÷ 2 = 175 ÷ now divide by 5 ⇒ 2
175 ÷ 5 = 35 ← divide by 5 again ⇒ 5
35 ÷ 5 = 7 ← now divide by 7 ⇒ 5
7 ÷ 7 = 1 ← factored when 1 is reached ⇒ 7
700 = 2 × 2 × 5 × 5 × 7 → D