So this one asks us, which of the following research questions would a cognitive psychologist ask? Let's run through them and see what we're thinking. So a is talking about how prosocial behavior might change from childhood to adolescence. That question is very developmental in nature, so we're going to cross that off. B is talking about how does culture impact the expression of emotions.
That sounds like we're considering the social context. Culture doesn't sound super cognitive, so we're going to cross that off. And then c reads, what strategies do people use when problem-solving? That is definitely a very common topic in cognitive psychology, so let's leave that one. And then d is talking about how people develop stereotypes; that tends to get covered more under social psychology, so we're going to cross off d and circle c as our answer.
And there you go.