water alone
water and gypsum alone
water, gypsum and methane
none of the above
Answer is Wrong!
Answer is Right!
The correct answer is (c).
Water is essential for life as we know it, and NASA has found evidence of water on Mars in the form of ice and liquid water. Gypsum is a mineral that is formed when water evaporates, and NASA has found gypsum deposits on Mars. Methane is a gas that is produced by living organisms, and NASA has detected methane in the Martian atmosphere.
(a) is incorrect because NASA has found evidence of more than just water on Mars.
(b) is incorrect because NASA has found evidence of gypsum on Mars, not just water and gypsum.
(d) is incorrect because NASA has found evidence of water, gypsum, and methane on Mars.