单选题

使用OC语言输出“This is a Objective-C program.”正确的是：

Question

A. NSLog(@"%s",This is a Objective-C program.);

B. NSLog(@"%@",This is a Objective-C program.);

C. NSLog(@"This is a Objective-C program.",%@);

D. NSLog(@"This is a Objective-C program.");