When you can't determine who arrived at an intersection first, yield to the vehicle a. closest to you on the left b. closest to you on the right c. across from you d. with the largest wheelbase

  B. closest to you on the right

Driver guidance in most jurisdictions will tell you to yield to the driver on the right. In practice, there may be reasons why you would not, including pedestrian traffic, or a signal from that driver that you should enter the intersection first.