It is eco-friendly to use bioasphalt for surfacing of the roads. Which of the statements given above are correct?
A1, 2 and 3 only
B1, 3 and 4 only
C2 and 4 only
D1, 2, 3 and 4
Answer & Solution
Correct answer: D. 1, 2, 3 and 4
UPSC CSE Prelims 2011 (GS-I, Set A), Q.4. Official answer key: D.
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