If you want to improve your muscular endurance?
a. low resistance with high reps
b. high resistance with low reps
c. low resistance with low reps
d. high resistance with high reps

A.) Low resistance with high reps

Explanation:

If you want to improve muscular endurance, the best way to it is to perform an exercise with low resistance and high reps. Endurance is the ability to do a moderate activity for a long period of time. Things like push ups and sit ups done at a lower resistance with a higher amount of repetitions can help build your muscular endurance.

Hope this helps ya :D