UPSC CSE Prelims 2016
The original statement, "We shall go either for a picnic or for trekking," asserts that at least one of these two activities will take place. To falsify this claim, a scenario must occur where neither activity happens. Option (D), "We do not go either for picnic or for trekking," directly negates the original statement by indicating that neither the picnic nor the trekking activity will be undertaken. This condition makes the initial claim demonstrably false.