Which sentence uses a verb that agrees with its compound subject?
a. neither the train nor the bus runs that late.
b. either dennis or shelly are bringing the appetizers.
c. at least two or three of the guests may agrees to play charades.
d. a taxi or the subway seem like good options.

The correct sentence of the four is this one:

Neither the train nor the bus runs that late.

and in this sentence the verb agrees with the compound subject, in the rest it does not (but it would not be a big mistake if the verb was in plural form here- there are arguments for a plural form here too).