How many positive even integers less than 100 contain digits 5 or 7?
Select the correct option
A) 10  B) 17  C) 18  D) 19  E) 20

Rationale: "two digit numbers : 5 at tens place : 50 , 52,54 , 56,58 7 at tens place : 70 , 72,74 , 76,78 if 5 and 7 is at units place , the number cant be even total : 5 + 5 = 10 answer a"
Answer: A