单项选择题

某C语言结构体的定义如下。
struct date
int year, month, day; ;
struct worklist
char name[20];
char sex;
struct date birthday;
person;
若对变量person的出生年份进行赋值,正确的赋值语句是 (33)

A.year=1976
B.birthday. year=1976
C.person. year=1976
D.person. birthday. year=1976