The correct answer among all the other choices is D. The sentence is correct as it is written. The sentence doesn't need to be revised. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
Answer:
making new friends can be tough but also rewarding
I would say that student activism received so much media attention because all of the above - because they were vocal, because they challenged the silent majority, because they were willing to question authority in an attention-getting manner, because their protests often ended in violence and disorder.
We ride both of them.. cars are rideables so as cycles.
