(B) Realistic
In SMART Goals, 'R' stands for Realistic — meaning the goal should be achievable and within one's capabilities.
SMART is an acronym: Specific, Measurable, Achievable, Realistic, Time-bound. The source passages do not directly mention SMART goals, but 'Realistic' is the standard accepted full form for 'R' in SMART Goals as per the CBSE curriculum. Option (B) is correct.