Answer: C) subordinating conjunction.
Explanation: a subordinating conjunction is a word that joins a dependent or subordinate clause (a phrase that doesn't have complete meaning on its own) with an independent clause (it has complete meaning on its own). There are subordinating conjunctions that show a relationship between two clauses involving a transition of time or place. In this case, "after" is a subordinating conjunction joining the independent clause "Mrs. Jenkins thanked them gratefully" and the subordinate clause "After the police came to her rescue."
I'm sorry but you got to give me specific detail.
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<span>Since an opinion is a personal belief about something, then the answer is B. The concert last night was better than any of us expected. This is because it's an opinion with which some might disagree. If someone believed that the concert was bad then the sentence would not apply and the person would have their own opinion.</span>