The best way to become a better reader is to: a) study longer and harder in every subject. b) engage in a variety of extracurricular activities. c) enrich background knowledge and vocabulary. d) limit reading to books that are interesting.

The most appropriate answer option is c) enrich background knowledge and vocabulary.

Explanation:

The best way from the given options, in my opinion, to become a better reader is to enrich background knowledge and vocabulary.

Reading is, by nature, a private and individual activity that can be carried out at any place at any hour of the time. But to become a better reader, one should try to read by developing the understanding of the content which can be achieved by enriching one's vocabulary and background knowledge.