Final answer:
The best type of rival among the options provided is 'A. Cooperative rival.' This is because a cooperative rival fosters a healthy competitive environment that is conducive to mutual improvement and respect.
Step-by-step explanation:
The question is about understanding what type of rival would be considered beneficial in a competitive context. Among the options provided, 'A. Cooperative rival' can be regarded as a good type of rival. A cooperative rival is someone who competes but also shares a mutual respect and may even push you to improve.
The competition with a cooperative rival is healthy because it encourages all competitors to constantly improve their skills or products, without resorting to negative or destructive tactics.
In contrast, an aggressive rival tends to focus on winning at all costs, potentially leading to unethical behavior. A substitute rival is not a commonly used term in this context. Lastly, a strategic rival does imply some level of planning but does not inherently suggest it is a 'good' or positive rivalry.