Select the most appropriate option to substitute the highlighted segment in the given sentence.
The interview will be conducted by 9 a.m. till 11 a.m.

Correct option is C

The correct substitution of the highlighted words is (c) from 9 a.m. to 11 a.m.
Explanation: The correct preposition pair to indicate a duration between two times is “from...to...” not “by...till...” or “during...till”.
Grammatical rule used:
Use "from X to Y" when referring to a range of time, distance, or quantity.
Example: The session lasted from 2 p.m. to 4 p.m.
Information Booster:
“Until” can also be used for ending time, but should be paired with “from” as: “from...until...”, which is a valid option too.