EPFO 2012 Solved Paper

Elusive means, not easy to catch/find/remember something. Capture means to take control of something. So, the given pair of words are antonyms to each other and the same relationship between the words given in option (b).
Headstrong means bullheaded, foolhardy, impulsive, without listening to advice from other people. Controlled means, composed disciplined, restrained, regulated, curbed.