The correct answer would be the first option. A collective subject is a noun (functioning as the subject) that describes a group made of many parts. For example, the words "team" which means a group of people playing. Another one is "pack" used in a pack of wolves, which means a group of wolves.
Answer:
Have you ever seen a beach at the Pacific ocean?
Explanation:
Using grammar you can also capitalize "Ocean" too. Pacific is nessecary because it's a name of something.
Because he knew Oedipus was the murderer.
