Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, select No substitution required.

A study has uncovered a previously overlooked law of natural selection based on "survival of the slacker", that is, spend all day lazing about could be good for human evolution.

A

No substitution required

B

spending all day lazing about must be good for human evolution

C

spend all day lazing about will be good for human evolution

D

spending all day lazing about could be good for human evolution