Stefan is reading scientific articles and research reports to answer his research question for a paper. What should Stefan do when he encounters scientific words in the texts?

A)Find out the meanings of most of the scientific words in all the articles.

B)Guess at the meanings of the scientific words he doesn’t know.

C) Learn the precise meanings of the scientific words that apply to his topic.

D) Memorize the precise meanings of all scientific words in all the articles.