The correct element is B - evidence. Statistics and other examples can be used as evidence for a research paper.
Answer:
1-C
2-B
Explanation: Taken directly from the article.
a distinctive head covering emblematic of a position or office:
or
[ C ] an upper limit on the amount of money that can be spent or charged in connection with a particular activity: a price/salary/spending cap. a cap on sth They called for the government to keep the cap on public-sector spending.