Correct Answer: Posthumusly

Solution : The correct answer is the third option.

The incorrectly spelled word is "posthumously." The correct spelling is "posthumously".

It is an adverb used to describe something that happens, is awarded, or is published after the death of the person to whom it is dedicated.

The meanings of the other options are as follows:

Cushion: A cushion is a soft support, often used for comfort on a chair or sofa.

Scientist: A scientist is a person who engages in systematic activity to acquire knowledge in a specific field, typically through experimentation and analysis.

Laboratory: A laboratory is a controlled environment where scientific experiments, research, and measurements are conducted.

Therefore, the correct answer is posthumously.