28) B

The main condition to sustain life, according to the text, is that the Earth-sized planets should be at the right distance from their star. The conclusion of the text is the last sentence “So if the Kepler…life on planets other than Earth”. The flaw in the argument is that the text assumes that Earth-sized planets that are at the right distance from their star is the only condition needed in order to sustain life.

A – Wrong
Earth-sized planets is not the complete criteria for life. The right distance from the star is.

B – Correct
The text assumes that the right distance from the star is the only criteria needed in order to sustain life.

C – Wrong
This is a fact rather than an assumption. The Kepler telescope will definitely help to find planets that are the right distance away from their star.

D – Wrong
This is a fact rather than an assumption. Highly sensitive equipment are needed to detect the existence of planets.

E – Wrong
The presence of liquid water is definitely not sufficient for life to exist. So this is not an assumption.

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