C
Below is a question with multiple-choice answers. Choose the correct option based on your reasoning.

### Question:
Which of the following is an example of genetic engineering?

### Choices:
A. Growing a whole plant from a single cell.
B. Finding the sequences of bases in plant DNA.
C. Inserting a gene into plants that makes them resistant to insects.
D. Attaching the root of one type of plant to the stem of another type of plant.

### Answer:
