Answer:
The answer seems to be D.
Explanation:
I cannot explain why D is correct, but I can tell you why the others are wrong.
A: Choice A is a run on sentence. It doesn't have the word "by" between "team...tackling..." If it had the word "by" then it would've been up for consideration, however it would still be wrong since there is no comma to prevent this phrase from becoming a run-on sentence.
B: The beginning of the sentence starts with a dependent clause and ends in an independent clause. This is completely incorrect, and an easy choice to eliminate when you read this.
C: Again, this sentence is really jumbled up. it is a combination of a comma splice and it doesn't have the word "by" between the words I mentioned in the explanation for Choice A. I'd also say that this sentence starts with a sentence fragment. Either way, this choice is most likely wrong.
I'm sorry I could not give you an answer with 100% surity. But, I really am confident that the answer is D. Try it out, comment, and if it works? Rate it and drop a thanks :)
