खालील विधाने पहा : (a) सुर्यावरील डागांचे चक्र 11 वर्षाचे असते. (b) सुर्याकडून येणाऱ्या सौरशक्तीपैकी 23 टक्के सौरशक्ती ढगाकडून अवकाशाकडे परावर्तीत होते.

The correct answer is Option C (Both statements (a) and (b) are correct.).

Key Points:
• Both atmospheric solar radiation facts are correct: Statement (a): Sunspots follow a periodic activity cycle averaging 11 years (Solar cycle).
• Statement (b): In Earth's heat budget, 35 units out of 100 are reflected as planetary albedo, of which clouds reflect 23 units, 2 units from snow/ice, and 10 units from atmosphere back into space.
• Thus, (a) and (b) are both correct (Option 3).
• Key Takeaway: Sunspot cycle = 11 years; Cloud reflection = 23% of solar energy radiation.