Answer:
Yes, for instance...
Picking up trash can be a big help, less pollution for us!
Less factories
Less smokers to prevent air pollution once again.
For the virus right now, wearing mask can help a lot.
Staying quarantined also can help make a difference.
I hope this helps.
My guess is A, but I don't know for sure.
Answer:
A. Demonstrate proper technique la for yoga and aerobics
C. Both A and B! Hopefully it helps