The correct answer is: B. Instars
An instar is the developmental stage of an insect between two molts. The number of instars varies between insect species, but it is usually four or five. The first instar is the smallest, and the last instar is the largest. During each instar, the insect grows and develops. The final instar is called the pupal stage, during which the insect transforms into an adult.
A grub is the larval stage of a beetle. Grubs are typically legless and have a soft, segmented body. They feed on roots, leaves, and other plant material.
A caterpillar is the larval stage of a butterfly or moth. Caterpillars are typically hairy and have a long, slender body. They feed on leaves, flowers, and other plant material.
A pupa is the non-feeding stage of an insect’s metamorphosis. During the pupal stage, the insect’s body breaks down and reforms into the adult form.