_____ you may face, you must gather your courage to finish it. [ ]

A. However a difficult task

B. What a difficult task

C. However difficult a task

D. What difficult a task

现在程序的输出是______。 #include＜stdio．h＞ main() {int arr[10]，j，k=0； for(j=0；j＜10；j++) arr[j]=j； for(j=1；j＜4；j++) k+=arr[j]+j； printf("%d\n"，k)； }