Question: Write a multi-choice question for the following article: Article: There are many kinds of tigers in the world. The largest tiger is Northeast Tiger. Most Northeast Tigers live in the northeast of China, like Heilongjiang Province and Jilin Province. Because there are many forests, the tigers usually like living there. In the forest, there are not many people getting out and coming in. So the tigers are very free. They can _ each other and eat some small animals. The Northeast Tigers are different from other tigers. The Northeast Tigers can swim very well, but can't climb the trees. They can hear very well. The number of the tigers is smaller and smaller, we should try our best to protect the tigers.
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Question: The tigers are free because _ .Options:A they can play with each otherB they can eat some small animalsC there are many trees in the forestsD people seldom get out and come in the forestsAnswer:D