The correct sentence that uses punctuation properly with a subordinating conjunction is:
Because you offered to help.
The other options either misuse punctuation or do not require punctuation in the same way.
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.
I got the help I needed; because I needed some help.
I got the help I needed; because I needed some help.
You came over: because I needed some help.
1 answer
The correct sentence that uses punctuation properly with a subordinating conjunction is:
Because you offered to help.
The other options either misuse punctuation or do not require punctuation in the same way.