Answer:
Giving back
Step-by-step explanation:
The rich are now giving back to society.
Giving it is wrong. What are they giving?
Gave it is wrong. Gave is past tense, are is present tense.
Having it is wrong. What does society have to do with the rich having something?
Giving back is correct. Giving back means helping society in return for the help the rich received in the past.