Select the most appropriate ANTONYM of the highlighted word.
The recent disaster of unprecedented floods in June 2013 in the state of Uttarakhand devastated many towns and villages on the banks of the rivers Bhagirathi, Pindar, Mandakini, Alaknanda and Sarju.

Correct option is C

The most appropriate ANTONYM of the highlighted word "unprecedented" is (c) “Familiar”. Here are the meanings of all the options:
 (a) Lacklustre: lacking in vitality, force, or conviction; dull or uninspired
 (b) Tarnished: lose or cause to lose luster, especially as a result of exposure to air or moisture
 (c) Familiar: well-known from long or close association
 (d) Deranged: mad; insane
 Out of these options, "unprecedented" means something that has not been done or experienced before, so its antonym would be something that is well known or has been experienced before, which fits the meaning of "familiar". Therefore, option (c) is the correct answer.