If a and b are even numbers, which of the following CANNOT be the value of ab?  Choose the correct option
A) 6 B) 14 C) 21 D) 24 E) 26
21 is a odd number. The multiple of two even number should be an even number   ans 21
<result>C</result>
If a and b are even numbers, which of the following CANNOT be the value of ab?