GATE CS 2017 Set 2 QGA-2 — General Aptitude

The correct option is B.

In English grammar, when the word "enough" is used as an adverb to modify an adjective, it must be placed after the adjective it modifies.

The standard structure is:

$$\text{Subject} + \text{Verb} + \text{Adjective} + \text{enough} + \text{to-infinitive}$$

Applying this rule to the given sentence:

• Adjective: bright
• Adverb: enough
• To-infinitive: to be seen

Thus, the correct phrase is "bright enough", making the complete sentence: "Saturn is bright enough to be seen on a clear night with the naked eye."

Why other options are incorrect:

• Option A ("enough bright"): Incorrect because "enough" is placed before the adjective "bright".
• Options C and D: Grammatically incorrect and redundant combinations of "as" and "enough".