Correct Answer: found

Solution : The correct choice is the fourth option.

Explanation:

In the context provided, the focus is on what the scientists did in relation to the chefs' reliance on a specific motion. The word found is fitting as it implies the scientists discovered or established a certain fact or truth. In contrast, the other options don't precisely convey the idea of uncovering or determining information as required in this context.

The meanings of the other options are as follows:

• Invented suggests creating something new.
• Innovated means to introduce new ideas, methods, or approaches.
• Planned refers to the process of making plans.