A statement we accept without proof is called a
postulate. It is also known as an axiom. These are rules which are accepted to
be true without any evidence that will prove these. For instance, the
postulates in the kinetic molecular theory.
"Sentence 2- The car needed a new battery, and Jack was broke" is the sentence among the following choices given in the question that contains a subordinating conjunction. The correct option among all the options that are given in the question is the third option or option "C". I hope the answer helped you.