对于下面的代码，不能够正确得到结果'yellow'的代码是（ ）。'red', 'banana'=>'yellow');?>

A. echo "A banana is $fruits['banana']";
B. echo "A banana is {$fruits['banana']}";
C. echo "A banana is {$fruits[banana]}";
D. echo "A banana is $fruits[banana]"