Which of the following is the best strategy for increasing self-control? a. I have the willpower and I know I will complete my work today itself. b. I am really going to study hard for my history test...

Which of the following is the best strategy for increasing self-control?

a. I have the willpower and I know I will complete my work today itself.

b. I am really going to study hard for my history test this week.

 c. I am going to study till late night. If my friend calls asking me to accompany him for a movie, I shall tell him that I will go with him the next time.

d. Before sitting down to study, I will pray for some time so as to feel more energetic to study.