Identify the misspelt word in the given sentence.
Here he continued to prosecute his scientific researches and his multifarious studies with unabeted diligence.

Correct option is D

Option (d) is the incorrectly spelt word.
Correct spelling is: "unabated".
Unabated means continuing without becoming weaker, less intense, or reduced. It is commonly used to describe something that remains strong or constant. (बिना कम हुए, निरंतर जारी रहने वाला)
Example:
The rain continued with unabated force throughout the night.
Meanings of all the given options:
· (a) Multifarious: Having many different kinds or forms; diverse. (विविध, अनेक प्रकार का)
· (b) Diligence: Careful and persistent effort or hard work. (परिश्रम, लगन)
· (c) Prosecute: To institute legal proceedings against someone; also, to continue or carry out an activity. (अभियोग चलाना; जारी रखना)
· (d) Unabeted (Incorrect): The correct spelling is unabated.