what are the prime factors of 90?\na 1, 90\nb 1, 3\nc 2, 3, 5, 90\nd 2, 3, 5

Explanation:

Step1: Start prime - factorizing 90

Divide 90 by the smallest prime number 2. $90\div2 = 45$.

Step2: Continue factoring 45

Divide 45 by 3. $45\div3=15$.

Step3: Factor 15

Divide 15 by 3 again. $15\div3 = 5$.

Step4: Analyze the prime factors

Since 5 is a prime number, the prime - factorization of 90 is $90=2\times3\times3\times5$. The distinct prime factors of 90 are 2, 3, and 5.

Answer:

D. 2, 3, 5