the Olympic Games is or are held every four year

[Simonlue]

Dear English teachers,
The Olympic Games____ held_____years in different counties in turn now.
A. is, every four B. are, every five C. are, every four
correct answer:c
please explain the reason for it.
Whether the choice A is appropriat or not here.
Thank you for helping me in advance.
Sincerely,
Simonlue

[Barb_D]

The "Games" is a plural word, so it requires the plural form of the verb, which is "are."