Facts: A sells B his vehicle for EUR 5,000 and wants to hand over the vehicle to B on May 14 in Linz. On the same day, B is to transfer the EUR 5,000. While B transfers the EUR 5,000, A has unexpectedly been in Innsbruck since May 3 due to a quarantine order and cannot come to Linz to hand over the vehicle.

Question: What options does B have?