Select the correct alternative to fill in the blank with the correct preposition in the following sentence.
Their surprise gift came ________ the form of a new laptop.

Correct option is C

The correct option is (c).

Explanation:
The correct option to fill in the blank is (c) in. The phrase 'in the form of' is a standard English idiom used to describe the manifestation or shape of something. (के रूप में)
Example: Relief arrived in the form of food and medicine.

Why other options are incorrect:

• on: Does not collocate with 'the form of'.
• by: Usually indicates the agent of an action, not the shape/form.
• of: While 'of' follows 'form', the preposition 'in' must precede it to indicate the manner of arrival.