What hedging language is used here to show the author’s degree of confidence？“One of the main functions of the pancreas is to produce hormones.”

What hedging language is used here to show the author’s degree of confidence？“One of the main functions of the pancreas is to produce hormones.”
A.Adverb
B.Adjective
C.Modal verb
D.Introductory verb
正确答案：Adjective