Anecdotes are stories from the past, a part of someone's personal experience which is why they have to be factual if they are to be truthful. They can usually be checked, so i would say the correct answer is D. They are the main source of information in cryptozoology, since the main source is actually folklore, not anecdotes.
Answer: a person climbing a cliff
: external
two people arguing: external
a student struggling to focus: internal
Explanation:
These are four folktales that I have heard of
Why the sun and the moon live in the sky.
The leopard man.
The two friends.
The red and blue coat.