A. 10%
A.
B. 30%
B.
C. 50%
C.
D. 70%
D.
Correct Answer: B
সঠিক উত্তর: B
Explanation
ব্যাখ্যা
The Earth's overall average albedo is about 0.3, meaning roughly 30% of incoming solar radiation is reflected back into space by surfaces like clouds, snow, and ice.