单选题：a与b定义如下，下列哪个是正确的

a与b定义如下，下列哪个是正确的 @[A](2)

a = '123'

b = '123'

A. a == b
B. a == 123
C. a + b = 246
D. a + b = 123123




A.a == b
B.a == 123
C.a + b = 246
D.a + b = 123123


答案：A