Five years ago, the number of trees in a forest was f. Today, the number of trees in the forest can be represented by the given expression.

Which set of statements is true?
A.
The number of trees in the forest decreased by 33%.
An equivalent expression that represents this situation is f − 0.33f.
B.
The number of trees in the forest increased by 133%.
An equivalent expression that represents this situation is f + 1.33f.
C.
The number of trees in the forest decreased by 133%.
An equivalent expression that represents this situation is f − 1.33f.
D.
The number of trees in the forest increased by 33%.
An equivalent expression that represents this situation is f + 0.33f.