The word "himself" is an example of an emphatic pronoun.

Emphatic pronouns are used to emphasize or give importance to the noun or pronoun that they refer to. They are formed by adding "-self" or "-selves" to certain personal pronouns (such as "him" or "her").

In the given sentence, the pronoun "himself" is used to emphasize that it was the prime minister who personally congratulated someone. It adds emphasis to the subject (the prime minister) and highlights his direct involvement in the action of congratulating.

Here is a breakdown of the different types of pronouns mentioned in the question, along with their explanations:

1. Relative Pronouns: These pronouns are used to introduce relative clauses and connect them to the main clause. They include words like "who," "whom," "whose," "which," and "that." However, the word "himself" is not a relative pronoun.

2. Reflexive Pronouns: Reflexive pronouns are used when the subject and the object of a sentence refer to the same person or thing. They are formed by adding "-self" or "-selves" to certain personal pronouns. Examples include "myself," "yourself," "himself," "herself," "itself," "ourselves," "yourselves," and "themselves." While "himself" is a reflexive pronoun, it is not the correct answer in this case.

3. Personal Pronouns: Personal pronouns are used to refer to specific people or things. They include words like "I," "you," "he," "she," "it," "we," and "they." While "himself" is a personal pronoun, it is not the correct answer in this case.

4. Emphatic Pronouns: Emphatic pronouns are used to emphasize or give importance to the noun or pronoun that they refer to. They are formed by adding "-self" or "-selves" to certain personal pronouns. Examples include "myself," "yourself," "himself," "herself," "itself," "ourselves," "yourselves," and "themselves." In the given sentence, "himself" is used to emphasize the prime minister's direct involvement in the action of congratulating someone. Therefore, the correct answer is "emphatic."

Emphatic