Answer:
C) Major bands and singers can raise awareness to a global crisis to a vast audience, including leaders.
Explanation:
The major concerts would be able to affect foreign policy through their awareness to global crises like the Coronavirus pandemic or the unjustified killing of the someone who happens not to share same skin colour with another person.
Their awareness will help to create wider audience which would help to attract much criticisim and solutions to the crises the are trying to let people know.