The adjectives in the given sentence are: In the modern era the definition of an ideal student has drastically changed.

Correct option is D

The correct option is (d) modern, ideal.
Correct answer explanation (English): "Modern" describes the "era," and "ideal" describes the "student." Both are adjectives qualifying nouns.
Correct answer explanation (Hindi): "Modern" शब्द "era" को और "ideal" शब्द "student" को विशेषित करता है। दोनों शब्द विशेषण (adjectives) हैं।
Why other options are incorrect (English + Hindi):
· (a) definition, ideal: "definition" is a noun, not an adjective. (गलत है, "definition" संज्ञा है।)
· (b) modern, drastically: "drastically" is an adverb, not adjective. (गलत है, "drastically" क्रिया विशेषण है।)
· (c) ideal, qualities: "qualities" is a noun. (गलत है, "qualities" संज्ञा है।)