Kon, David, and Mary tormed Widget Inc. Kon and David each received $40\%$ of the stock and Mary received the remaining $20\%.$ Ron contributed land with an FMV of $$70,000$ and an adjusted basis of $$20,000.$ The corporation also assumed a $$30,000$ liability on the property. David contributed land with an FMV of $$30,000$ and an adjusted basis of $$15,000.$ David also contributed $$10,000$ in cash. Mary received her stock for services rendered. She normally would bill $$20,000$ for these services.

What is Widget's basis in the land received from Ron?

A$.$ $$20,000$

B$.$ $$30,000$

C$.$ $$50,000$