单选题If a and b are integers and the sum of ab and b is even, which of the following could be true?Ⅰ. a and b are both odd.Ⅱ. a is even and b is odd.Ⅲ. a is odd and b is even.A Ⅰ onlyB ⅡonlyC Ⅲ onlyD Ⅰ and ⅡE Ⅰand Ⅲ
题目
单选题
If a and b are integers and the sum of ab and b is even, which of the following could be true?Ⅰ. a and b are both odd.Ⅱ. a is even and b is odd.Ⅲ. a is odd and b is even.
A
Ⅰ only
B
Ⅱonly
C
Ⅲ only
D
Ⅰ and Ⅱ
E
Ⅰand Ⅲ