单选题

NSArray *array=[NSArray arrayWithObje...

Question

NSArray *array=[NSArray arrayWithObjects:@"2",@"3",@"4",@"1", nil] 
int a=[[arr objectAtIndex:0]intValue]
for（int i = 0, i < arr.count - 1,i++){ 
    int b=[[arr objectAtIndex:i]intValue]
    if(a < b){
        [arr replaceObjectAtIndex:0 withObject:[NSString stringWithFormat:@“%d”,b]]
} 
a=[[arr objectAtIndex:0]intValue]
}
NSLog(@“%d”,a)

上述程序输出是（）

A. 1

B. 2

C. 3

D. 4