单选题

以下代码将打印出d的值是： int a = 10 ...

Question

以下代码将打印出d的值是：

int a = 10                      
    __block int b = 20                
    void (^testBlock)(int) = ^(int c){
        int  d = a + b + c
        NSLog(@"d=%d", d)
    }
    a = 20 
    b = 40  
testBlock(30) 

A. d=60

B. d=70

C. d=80

D. d=90