4. As part of McGonigal's counterargument, which groups does she identify as the opponents of her claim?

She identified group of nongamers as the opponents of her claim.

Explanation:

'Reality Is Broken: Why Games  Make Us Better and How They Can  Change the World' is a book written by Jane McGonigal. In her book, she presents a counterargument that why games is good for human and future of humans.

Jane McGonigal is a Game programmer, who adovates the use of technology and games. In her book, she presents her agrument in favor of using games and asserts that games tends to fulfill humans needs and they are doing so not just in present times but doing so since ancient times when Atys was King of Lydia. During those times, the people were faced with famine and to face the situation they come up with a resolution of involving in games to distract themselves from hunger and thus it helped them to survive for eighteen years.

She asserts that opponents to her claim will be a group of nongamers who makes up of nearly half of the US population. She asserts that nongamers would not agree with her claims as this group of people perceive gaming to be a waste of time.