Debbie bought her home $15$ years ago for $$60,000.$ Three years ago, Debbie married Nia, and she moved into the same house and has lived there since. If they sell their house in the current year for $$340,000,$ what is their taxable gain on a joint tax return?

a$.$ $$280,000$

b$.$ $$155,000$

c$.$ $$0$

d$.$ $$30,000$