**Core Concept**
The question is testing the student's knowledge of the reproductive strategies in animals, specifically the mode of reproduction where embryos develop inside eggs that hatch inside the mother's body, and the young are nourished by a yolk sac before being born alive.

**Why the Correct Answer is Right**
Ovoviviparity is a reproductive strategy where the embryos develop and hatch inside eggs within the mother's body, but the developing young receive no additional nourishment from the mother after hatching. This is in contrast to viviparity, where the young receive nourishment from a placenta. In ovoviviparous animals, the yolk sac serves as the primary source of nutrition for the developing young. Examples of ovoviviparous animals include some species of snakes, lizards, and fish.

**Why Each Wrong Option is Incorrect**
**Option A:** Viviparity is a different reproductive strategy where the developing young receive nourishment from a placenta.
**Option B:** Oviparity refers to laying eggs outside the mother's body, with the developing young receiving no nourishment from the mother.
**Option C:** Insectivorous animals are those that primarily consume insects, but this term does not describe a mode of reproduction.

**Clinical Pearl / High-Yield Fact**
Ovoviviparity is an important adaptation in certain animal species, allowing them to give birth to live young in environments where it may be challenging to provide sufficient nutrients for fetal development.

**Correct Answer:** C.