High, pointed cusps indicate a diet of insects. Therefore, the option D holds true.
What is the significance of a diet?
A diet can be referred to or considered as an intake of food or edibles that provide nutrition to the one who consumes them. A diet includes a number of nutrients such as proteins, vitamins, carbs, etc. Diet of different species differs as per the requirement of the nutrients in their body.
The diet of insects is such that there is no requirement of nutrients in higher quantities. As a result, insects consume cusps as a part of the regular diet.
Therefore, the option D holds true and states regarding the significance of a diet of insects.
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