Question: Students want to plant a lemon tree at their school, but the cold winter temperatures in Massachusetts would kill the tree. Which of the following is the best solution to this problem?

  Options: 
 A. planting several lemon trees together in a row
 B. building a greenhouse to shelter the lemon tree
 C. giving the lemon tree extra fertilizer in the winter
 D. tying a stake to the lemon tree for support during the winter 
Answer: B