Step 1: Understanding macro cycle.
A macro cycle in training refers to the longest training cycle, usually lasting several months. It encompasses the entire training plan for a specific time period and includes various phases of preparation, competition, and recovery.
Step 2: Understanding the reason.
The reason states that the macro cycle includes only 10-12 days of training. This is incorrect because the macro cycle spans a much longer period (typically several months), not just 10-12 days. Therefore, the reason is incorrect in explaining the assertion.
Step 3: Conclusion.
Therefore, both statements are correct, but the reason does not correctly explain the assertion, which makes option (D) the correct answer.
Final Answer: (D) (A) and (R) both are right and (R) is not correct explanation of (A).