Select the most appropriate antonym for the word provided in the bracket to fill in the blank.
The professor delivered a ___________________ lecture on quantum physics. (simplified)

Correct option is D

The correct antonym of the given word is (d) Complex.
Simplified: Means made easier to understand (सरल बनाया हुआ).
Example: The teacher simplified the concept for better understanding.
Complex: Means difficult to understand (जटिल).
Example: Quantum physics is a complex subject for beginners.
Synonyms of Simplified: Easy, clear, understandable, basic.
Antonyms of Simplified: Complicated, complex, intricate, difficult.
Meanings of other given options and why they are incorrect:
• Lengthy – Long in duration (लंबा), not the opposite of ‘simplified’.
• Plain – Simple or clear (सादा), a synonym, not an antonym.
• Refined – Polished or improved (परिष्कृत), irrelevant in this context.