Step 1: Concept
Educational psychology focuses on understanding how people learn, the processes involved in learning, and the methods to facilitate effective teaching.
Step 2: Meaning
Assertion (A) suggests that knowledge of educational psychology helps teachers create optimal learning conditions. Reason (R) states that educational psychology informs teachers about strategies for pupil learning, leading to appropriate teaching methodologies.
Step 3: Analysis
Reason (R) directly supports and explains why teachers would be able to create desirable learning situations as stated in Assertion (A). The knowledge of educational psychology indeed helps teachers understand effective teaching strategies and methods that can lead to a positive classroom environment conducive to learning.
Step 4: Conclusion
The reason provided accurately explains how the knowledge of educational psychology contributes to creating favorable learning conditions, thus supporting the assertion.
Final Answer: (A)