I would have to say formal, mainly because I looked it up on google.
The name of Pollyannas aunt is Aunt Polly
A landslide is any geologic process in which gravity causes rock, soil, artificial fill or a combination of the three to move down a slope. Several things can trigger landslides, including the slow weathering of rocks as well as soil erosion, earthquakes and volcanic activity. (I gooogled this sorry if it doesn’t help, it might help you cancel out some answers tho)
Answer:
A is scholarly articles
B is popular articles and
C is books
Explanation:
Scholarly articles are peer reviewed and researched well. Popular articles give you a basic summary and books are written over a longer time due to the length