Answer:
The correct answer is implied metaphor , the latter is a literary device that is used to make a comparison between things that might be very different from each other. Moreover, the comparison usually makes use of imagery and it appeals to the senses, as a result, there is no explicit reference to the fact that a comparison is being made. Similies, for example, are comparisons that always involve the use of the words "like" or "as".
In the sentence provided in the question, we notice that Marissa's situation is being described in connection to her isolation and enjoyment of what she is living, this is according to the metaphor of the island that is described.
This is not a similie because the words "like" and "as" don't appear. It is not an allusion because allusions take us to compare a situation with someone or something that is very well-known; And finally, it is not personification beause there is no object with human attributes in this sentence,
