The correct answer is:
On the other hand.
"He looked forward to visiting with old friends. Greta, on the other hand, dreaded seeing her old boyfriend."
This phrase is showing Greta and Fred are having different feelings in that moment, creating a contrast between both of them.
I do not believe a comma is necessary in this sentence at all. In fact, if you were to insert a comma after the word grazed (as you maybe tempted to do) it could change the meaning of the sentence. If you meant the lions were oblivious of the presence of the gazelles, you would insert a comma after grazed. But if you meant the gazelles were oblivious of the presence of the lions, you would leave the comma out.
I can't tell what's the poem and what's the question, maybe can you put the poem in quotations? Either that or you didn't write it correctly.
Answer:
D) With the help of local volunteers, many parks and reserves manually remove invasive plants and often animals.
Explanation:
It's the only answer that makes sense.
Conclusion summarizes the main point i think
