How many unique positive odd integers less than 90 are equal to the product of a positive multiple of 5 and an odd number? Choose the correct choice from the following options
A) 4
B) 9
C) 11
D) 12
E) 15

Rationale: "the question basically asks how many positive odd integers less than 90 are odd multiples of 5 so we have 5 , 15,25 , 35,45 , 55,65 , 75,85 = 9 ans b"
Answer: B