Choose the word or set of words that, when inserted in the sentence, best fits the meaning of the sentence as a whole. 

The ------- of trees in East Africa has caused the number of native antelopes to ------- sharply because they can live only where the forest is most dense.

1.   planting . . decline
2.   destruction . . grow
3.   felling . . decrease
4.   abundance . . dip
5.   protection . . drop