What device does the author use when he states that Alexander and his family had very different blueprints for achieving his happiness?

A) metaphor
B) onomatopoeia
C) paradox
D) personification

A) metaphor

Explanation:

Let us first briefly define each of the answers.

Metaphor is a figure of speech used to somehow compare to seemingly unrelated things through a feature they have in common. Basically, that means we express one unknown thing by comparing it to another known thing.

Onomatopoeia is, basically, creating a word from a sound it makes (buzz, splash, slam, bang etc.)

Paradox can be defined as a statement that, when logically examined, contradicts itself.

Personification is, simply, giving living beings' features and traits to inanimate objects.

Blueprint is design plan or a sketch or an idea for something. Of course, there is no such thing for achieving one's happiness. But knowing that main feature of a blueprint is an idea, a plan, we know that the author tried to say that Alexander's plans differed from his family's, meaning that blueprint is a metaphor for plan or idea.