Also, however, and moreover are examples of C. relative pronouns
A relative pronoun is a word that is used to connect an independent clause to a dependent clause. Relative pronouns are meant to provide more information about the subject it relates to. A Relative pronoun is a pronoun that marks a relative clause. It serves the purpose of conjoining modifying information about an antecedent referent.
An example is a word which in the sentence "This is the house which Jack built." Here the relative pronoun conjoins the relative clause "Jack built," which modifies the noun house in the main sentence. Which has an anaphoric relationship to its antecedent "house" in the main clause.
The most common relative pronouns are who, whom, whose, which, and that. Sometimes, when and where can be used as relative pronouns as well.
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