The sentence that correctly uses punctuation with a subordinating conjunction is:
Because you offered to help.
The other sentences either misuse punctuation or do not correctly represent the use of subordinating conjunctions.
Responses
Because you offered to help.
Because you offered to help.
Because of you, I was able to get the help I needed.
Because of you, I was able to get the help I needed.
You came over: because I needed some help.
You came over: because I needed some help.
I got the help I needed; because I needed some help.
I got the help I needed; because I needed some help.
1 answer
The sentence that correctly uses punctuation with a subordinating conjunction is:
Because you offered to help.
The other sentences either misuse punctuation or do not correctly represent the use of subordinating conjunctions.