Correct Answer: Gambit

Solution : The correct choice is the third option.

Explanation : In this context, the phrase "calculated move to gain an advantage" suggests a strategic and intentional action. Gambit is a term commonly used to describe a calculated opening move in chess or any other deliberate strategy employed to achieve an advantage.

Therefore, the correct one-word substitute is gambit.

The meanings of the other options are as follows:

• Grunt refers to a low, guttural sound.
• Bonsai refers to a Japanese art form of cultivating small trees in containers.
• Profit is related to a financial gain.