Here's a problem to solve: Balsam fir trees in Maine have similar needle length. Why do the trees have similar needle length?

Among the 4 following options, which is the correct answer?

- A: because of the amount of sunlight they receive
 
- B: because of their closeness to the ocean
 
- C: because of the inherited information inside the seeds
 
- D: because of the type of insects that eat the needles
 