阅读下列短文，从每题所给的 A、B,C、D 四个选项中，选出一个最佳答案。

Mike is an 8-year-old boy. One day after school, he sees a small dog. It's lost.

Mike goes to the dog. "Hello," he says to the dog. The dog has a collar (项圈). He looks at the black collar. The dog's name is on it. Its name is Spike. Spike is a nice, brown dog. "Come here, Spike." Mike says to the dog.

Mike takes Spike to his home and gives it some dog food. But he knows Spike isn't his dog. He wants to help it find its owner (主人) . Mike writes (写) some posters and puts them up (把……张贴) at bus stops (汽车站). The posters say "Found Dog". But no one comes to find Spike.

Now, Spike has a new house in Mike's room. It's under the desk. And they're good friends.