The correct answers are as follow:
a) Because he had a headache, he could not enjoy himself at the party.
b) You call me, because you are in trouble, so that I can help you.
c) When she returned home, she went to bed immediately, because she was thoroughly exhausted.
Subordinating conjunction
A word or phrase that connects a dependent sentence to an independent clause is known as a subordinating conjunction. This word or phrase denotes a cause-and-effect link or a change in time and location between the two clauses, indicating that the clause has informational value to contribute to the sentence's primary concept.
Because conjunctions have just one goal, namely to demonstrate a cause-and-effect link between a subordinate clause and the main clause, they are the subordinating conjunctions that are easiest to understand.
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