Which type of pronoun is boldest in the following sentence the truck which sometimes stalls belongs to our neighbor?

In the sentence "the truck which sometimes stalls belongs to our neighbor," the boldest pronoun is "which." It is a relative pronoun that introduces the relative clause "which sometimes stalls," providing additional information about the noun "truck." Relative pronouns like "which" help link the clause to the noun, enhancing the sentence's detail and clarity.