Answer:
Hope it helps check the image
Explanation:
Question?....................
Hi there☺
I believe the answer is the second one, "<span>when the ideas in both clauses are closely related."
For example:
I really love cats; they are so cute and sweet.
Both are independent clauses, but are closely related ideas.
Hope this helped you.
~Elisabeth</span>
The last one, Before his European travel- the highlight of his summer-... ect.
is the right answer