What does muscular strength measure?

Muscular strength determines the amount of force, which a group of muscle or muscle can impart in a single attempt. It determines how much weight can be lifted at the time of a contraction, however, it does not determine how many repetitions one can perform.  

The 1RM or the one-repetition maximum test refers to an exercise regime, in which an individual does one repetition of a solitary exercise to witness how much weight he or she can lift. It is the standard test that helps in determining the strength of the muscle.  

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out of the choices i'd say d the ability to set goals, mainly because to desire to continue you need motivation but it isn't motivation in that part, but setting goals means you have an endgame and you want to reach it which sums up motivation.