Answer: The correct answer is A
Explanation: Let's substitute each word in to see which makes sense.
A. All the board games are now stuck under the table.
B. All the board games is now stuck under the table.
C. All the board games we're now stuck under the table.
The first answer makes more sense because it is present tense and refers to multiple things, rather than one thing.
I hope this helps!! :)
