Select the most appropriate option to fill in the blanks.
The school's ____ gave a speech on moral values, explaining how living by a good ____ shapes character.

Correct option is C

The correct option is (C).

Explanation: The correct option to fill in the blank is (C) principal; principle. The first blank requires a noun referring to the head of a school, which is "principal." The second blank requires a noun referring to a fundamental truth or rule of conduct, which is "principle." (प्रधानचार्य; सिद्धांत)
Example: The principal of the college is a man of high principles.

Why other options are incorrect:

• Option A (principle; principal): Incorrect because 'principle' refers to a rule, not a person in charge, and 'principal' is not used for moral rules here.
• Option B (principal; principal): Incorrect because the second blank needs the word for a moral rule (principle), not a school head.
• Option D (principle; principle): Incorrect because the first blank needs the word for a school head (principal).