Tim Agrees to Sell JJ His Skateboard for $200 Provided

Tim agrees to sell JJ his skateboard for $200 provided that JJ pays the $200 within the next 3 days.JJ shows up 4 days later with $200 demanding the skateboard but Tim refuses to sell JJ the skateboard.What can JJ do?

A) Enforce the contract because he is only one day late.
B) Enforce the contract because Tim is estopped from refusing to sell the skateboard.
C) Nothing, because the contract is unenforceable due to JJ's failure to accept in the required manner.
D) Nothing because the contract is not in writing.