In an endurance mesocycle of a beginner's program, which rep and set scheme would be most appropriate?

12-15 reps, 3 sets
4-6 reps, 1 set
8-10 reps, 4 sets
2-5 reps, 5 sets

Endurance Mesocycle is a specific block of training which is designed to attain a specific goal.

This technique can be used in aerobic and sports to train the candidates for tournaments.

Usually a long duration training program is divided into weeks creating smaller tasks which ultimately attains the goal.

These best rep and set scheme for beginners program is 12-15 reps, 3 sets.

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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.