It seems that you have missed the necessary details for us to answer this question, but hope this would help you. The line in the given passage that is considered a flashback is this: <span> She thought of her last day in middle school, seven years ago, when Sarah had given her an iPod. Have a great day!</span>
The word 'unfathomable' means not able to be understood.
to 'fathom' is to think or ponder on something so as to understand it.
The technique of alliteration is being used. Alliteration is the occurrence of the same letter or sound at the beginning of closely connected words.
The gerund phrases are:
- "Being the accounts manager" (Subject)
- "blowing bubbles to his little sister" (Subjet Complement)
Gerund phrases begin with a gerund or -ing word, and include other modifiers and objects. They function as nouns, and can be the subject, subject complement or direct object of the sentence.
The rest of the alternatives are not gerund phrases because options one and three possess an infinitive verb ("to bring" and "to win"), and "Hiking for two hours" is a present participle clause.