Jim, age 55, plays basketball with much younger adults and is concerned that his teammates might consider his age to handicap their team. his concern actually undermines his athletic performance. this best illustrates the impact of:

stereotype threat                        

Explanation:

Stereotype threat: The term stereotype threat represents the unpleasant or embarrassing situation that leads an individual or group of people to think that they are at risk of disclosing stereotypes towards his or her social group. Stereotype threat is an allegedly one of the contributing factors or reasons for withstanding gender as well as racial gaps in academic performance.

Factors that play a major role in an individual's stereotype vulnerability include domain and group identification, group membership, proactive personality or internal locus of control, etc.

In the question above, the statement signifies the impact of the stereotype threat.

the two sets of lines are :

answer; (b) knowledge based summaries of our beliefs and feeling about the self in particular domains;