The fact that the sperm and the egg fused to create a zygote while inside the female body, is reason to state that the answer is "<u>internal fertilisation</u>".
Asexual reproduction does not occur in crocodiles, and the other option of external fertilisation would occur in frogs, where the female lays eggs in a pond, and a male frog will fertilise it at a later stage.
Asexual: Offspring arise from single organism Sexual: Genetic information from two organisms (male and female), where one produces a motile gamete (male) that travels to fuse with a larger stationary gamete produced by other (female). Internal Fertilization: Union of an egg cell with a sperm during sexual reproduction inside the body of a parent. External Fertilization: The sperm cell reunites with the egg cell in the open, rather than inside the body of a parent.
:) I'm sure you can figure it out from the information I stated above
