Answer:
alliteration because it cant be onomatopoeia or simile or personification
The answer to your question is A
Along the narrow forest trail, ferns and tiny wildflowers grew. the other options don't have correct punctuation or grammar.
"she" would be the pronoun.
You can rewrite this question as "She is your best friend?"
So in that case, "she" would be the subject.
In English, you just switch around "is" and the subject to make a question and make it sound Englishy
PS in Italian (and probably other languages) you would just say "She is your best friend?"