Explanation:
no one is useful de.ar it will harm if we cut trees
it will harm if we drop glass
it will harm the environment that we burn tires
Since A, B and C are correct. I think the answer is D. Linguistic grammaticality and content or effective communication are separate matters.
Assuming this is latin, the translation is “it has been seen”
A prepositional phrase is a preposition and a noun, with or without the addition of a modifier. "At the corner" is the prepositional phrase in this instance.