Leah gives two favored relatives $$21,000$ each in $2024$ and gives another relative $$10,000.$ Assuming she has not exhausted her lifetime exemption amount, the three gifts simply reduce Leah$$s lifetime exemption by what amount?

A$.$ $$0$

B$.$ $$6,000$

C$.$ $$42,000$

D$.$ $$52,000$