My answer would be leadership or management. This is because as a leader, you manage other people, you supervise other people, you hopefully motivate other people and as a leader you need a good strategy.
The art of getting things done through people.
Leadership.
I don’t know what a short essay would look like but here’s a paragraph to help you start !
Doubt, as we can read from the Oxford dictionary means “A feeling of uncertainty or lack of conviction.” Throughout our lives many of us have experienced doubt. It’s feeling that we feel as we go about our lives. (Go on about your own experience with doubt)
I think the answer must be of B no.