The answer is A. B is correct, C is a comma splice, and D is correct
Answer:
Stratigraphy is a part of geology that is worried about the investigation of rock (layers) and layering (separation). It is fundamentally utilized in the investigation of sedimentary and layered volcanic rocks.
Explanation:
No dude stop lol yall annoying
Answer:
D. source has more than three authors.
Explanation:
'et al.' is used in the in-text citations where three or than than three authors are to be mentioned for a particular work. The meaning of the Latin word 'et al.' is 'and others'. The last name of the first author is written and then 'et al.' is added to it. A comma (,) is then added along with the year of the publication of the work. In this way, the in-text citation is shortened by just adding the last name of the authors.
