Measurement in psychology and other social sciences is more difficult than in physics and chemistry because many of the things that we .......... ........... directly by physical scales.

A) will have studied/would not be measured
B) have studied/didn’t measure
C) were studying/were not be able to measure
D) studied/might not measure
E) study/ cannot be measured

E) study/ cannot be measured

E.................

E şıkkıdır.

"E" is correct