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Explanation:

Let ‘a’ be the percentage of people who favoured exactly one proposal, ‘b’ be the percentage of people who favoured exactly by two proposals and ‘c’ be the percentage of people who favoured exactly three proposals.

a + b + c = 78......(i)
a + 2b + 3c = 100.....(ii)

(ii) – (i) implies b + 2c = 22
Since c = 5, b = 12

Required percentage = b + c = 12 + 5 = 17%.

Hence, option (c).

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