Muscular mass can effect a persons flexibility

Yes. The bigger the muscle, the lower the flexibility and elasticity. As muscle increases, range of motion descreases, effecting overall flexibility.

for me i would

1.make a schedule

2. action plan

3. break up into simpler tasks

4.   prioritize tasks

5. delegate work

hope that

if any question leave comment

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.