How many unique positive odd integers less than 100 are equal to the product of a positive multiple of 5 and an odd number?
Choose the correct choice from the following choices
A) 4 B) 10 C) 11 D) 12 E) 15

Rationale: the question basically asks how many positive odd integers less than 100 are odd multiples of 5 so we have 5,15 , 25,35 , 45,55 , 65,75 , 85,95 = 10 ans b
Answer: B