The correct answer is A. Conjunction
Step-by-step explanation:
In language, a conjunction is a word necessary to link different sentences, clauses or elements. In English language, conjunctions are classified into coordinating conjunctions such as but, or, yet, and, nor or so that link elements of the same importance, and subordinating conjunctions such as because, until, although or if used to link elements with different importance.
This means, in the sentence "Alberto hates tomatoes yet adores spaghetti" the word "yet" is a conjunction because this links the elements "hates tomatoes" and "adores spaghetti". Also, yet is one of the coordinating conjunction that implies the elements linked in the sentence have the same importance.