Answer: D. make a conscious choice to do so
Step-by-step explanation:
Based on the information given, in order to attain a "right livelihood," William needs to make a conscious choice to do so.
Option A is wrong as getting promoted so he can delegate more of his work doesn't guarantee him that he'll relax more and enjoy right livelihood. When he's promoted, he'll have more work and this means that there'll be more responsibility. This will hinder him from enjoying right livelihood.
Option B and C are wrong as well as losing weight and getting in better shape and also de-emphasize the spiritual side of his life doesn't make one enjoy right livelihood.
Option D is the correct answer as he should make a conscious choice to attain the right livelihood and have enough rest that he desires.