单项选择题

It was a cold winter, and Mrs. Smith wanted to do some (41) . So she waited until it was Saturday, when her husband was free. She took him (42) the shops with her and let him (43) for everything and carry her bags. They went to (44) shops, and Mrs. Smith bought a lot of things. She often said, "Look, my dear! Isn’t that beautiful!" He then answered, "All right, dear. How much is it" and took his money (45) to pay for it.
It was dark when they came out of the last (46) . Mr. Smith was tired and thinking about (47) things. He wanted a nice meal and drank by the side of a warm fire (48) home! Suddenly his wife looked up at the sky and said, "Look at (49) beautiful moon, my dear!"
Without stopping, Mr. Smith answered, "All right, dear. How (50) is it\

A.this
B.the
C.a