The table shows the distance, in feet, that an object falls during the first 4 seconds after it is dropped from a height of 300 feet.

What is the object’s average speed during the time interval from 1 s to 3 s?

A.
40 ft./s

B.
43 ft./s

C.
48 ft./s

D.
64 ft./s

E.
80 ft./s