Yes the answer is b because c and d don't make any sence
No entiendo a mi me ha ha sido una gran persona que me lo he
A preposition is <span>a word governing, and usually preceding, a noun or pronoun and expressing a relation to another word or element in the clause, some examples of preposition words are,
-on
-over
-like
-before
In this case, the preposition word in the sentence,</span><span> The birds gracefully flew through the air, is Through </span>
