The young leader was reluctant to shoulder the responsibilities of the ministerial office.

Answer: Option C

Eager : strongly wanting to do or have something.
Anxious : feeling or showing worry, nervousness, or unease about something with an uncertain outcome.
Unwilling : not ready, eager, or prepared to do something.
Wanting : lacking in a required or necessary quality.
Reluctant : unwilling and hesitant; disinclined.

Synonym of Reluctant is Unwilling