Final answer:
Social support from teammates is not among the situational variables that cause increased state anxiety in young athletes; it is a protective factor that can lessen anxiety. So the correct answer is c) Social support from teammates.
Step-by-step explanation:
The situational variables that cause increased state anxiety in young athletes typically include factors that contribute to stress or worry in competitive situations. These factors include a) Fear of failure, b) Competitive importance, and d) Uncertainty about performance expectations. However, c) Social support from teammates is generally considered a protective factor that can lessen anxiety, rather than a variable that increases it.
Therefore, social support is NOT among the situational variables that cause increased state anxiety in young athletes. The situational variables that cause increased state anxiety in young athletes include fear of failure, competitive importance, and uncertainty about performance expectations. Social support from teammates, on the other hand, is a factor that can reduce state anxiety. Therefore, the correct answer is c) Social support from teammates.