Concept: The question tests on the application in Probability
Solution:
If the probability of an event happening is P(A), then the probability that the even wont happen = 1 - P(A)
Probability that the first sniper misses = 1 - 0.9 = 0.1.
Probability that the second sniper misses = 1 - 0.7 = 0.3.
Probability that the third sniper misses = 1 - 0.5 = 0.5.
Probability that all 3 miss their target = 0.1 * 0.3 * 0.5 = 0.015
Option A