The correct option is:
crest trough
In fact, the sentence can be completed as follows:
"The amplitude of a wave is the height of a wave as measured from the highest point on the wave crest to the lowest point on the wave trough."
D. Mineral and fossil matches from tests done on different continents.
W =F triangle d cosine0. F = 25 Newton’s. Delta d = 50 meters. Theta =40.0 degrees