_________ vaccine manufacturer has said its vaccine has been found to be 100 percent in prevent COVID-19 among adolescents ?

a) Moderna 
b) Pfizer
c) J&J
d) Sputnik

Moderna announced on May 25, 2021 that various studies have shown that its COVID-19 vaccine is 100 percent effective in preventing COVID-19 infection among adolescents aged between 12 and 17 years.