Answer:
I got a new puppy because I have been responsible lately.
Explanation:
Subordinating conjunctions are words used to connect dependent clauses to independent clauses and express the cause-and-effect relationship or a shift in time and place between these clauses.
It's important to know what each subordinating conjunction means.
<em>Sometimes</em> is not a conjunction at all. It is an adverb.
In the second sentence, there is no conjunction.
<em>If</em> is a conjunction used to introduce the condition necessary for the event described in the independent clause to take place. The third option is incorrect because the events have already taken place. A correct option would be:<em> I will get a new puppy if I am responsible</em>.
<em>Because </em>is a conjunction used to express a cause-and-effect relationship between the subordinate and independent clause. This is the only correct option. <em>Why did I get a new puppy? </em><em>Because I have been responsible lately.</em>