Answer:
B. Subordination
Step-by-step explanation:
Subordination is linking two clauses in a sentence so that one clause is subordinate to (or dependent on) another.
In subordination, a subordinate clause is attached to the main clause with the help of a subordinating conjunction.
There are many subordinating conjunctions. That is one of them. It introduces the attributive clause that showed her interest in science. The attributive clause refers to the noun books in the main clause 'Lupe’s room was full of books'.