Read the selection from the introduction [paragraphs 1-2]. Pfizer has recruited more than 2,000 kids ages 12 to 15 for its trial. However, Moderna reports having trouble recruiting the 3,000 12- to 17-year-olds needed for its trial. Volunteering to take a mystery shot for science can definitely give parents and teens pause.

What does the phrase “give parents and teens pause” in the selection tell the reader?

A
that someone will decide against volunteering
B
that someone might hesitate before volunteering
C
that parents are enthusiastic about volunteering
D
that teens think volunteering isn't worth their time