问题

My grandparents like to live in the countryside where they can enjoy ______ leisurely walk on the country road and feel ______ warmth of the sun on their faces.
A:the; ﹨
B:a; the
C:the; a
D:a; ﹨;
B:a; the
C:the; a
D:a; ﹨;
正确答案是: