Concept:Competition in the classroom can have both positive and negative effects, but some consequences are harmful to a child's overall growth, especially for low-performing students.
Explanation:Creating 'winners' and 'losers' leads to low self-esteem and anxiety in weaker students, harming their confidence.
Increased stress and anxiety from competition disrupts cognitive development and can push students to neglect other interests.
Building 'star' students may make schools proud, but it often humiliates low performers and hinders their learning.
Preparing students for market-based competition, when unhealthy, causes stress and reduces their desire to participate.
All four consequences listed are harmful because they negatively affect students' emotional and cognitive growth.
Answer:C. (i), (ii), (iii), (iv)