In the following passage some words have been deleted. Fill in the blanks with the help of the alternatives given. Select the most appropriate option for each blank.
There are certain spheres of one's life in which one should go by one's own (1)______ rather than follow another's counsel. The choice(2)______ one's subject of study is one such sphere. (3)______ one is genuinely interested in a subject, one (4)______ never opt for it. India is already full of (5)______ pegs in round holes, who are unfit for their roles and are doing more harm than good.
Select the most appropriate option to fill in blank number (4).