The complete sentence after filling out the appropriate pronoun will be, ''My sister got married last week. Her wedding was fantastic.'' Therefore, the option B holds true.
What is the significance of a pronoun?
A pronoun is a part of speech, which is used in order to replace a noun word or a phrase in a sentence. It is used instead of a noun phrase because such a noun has already occurred in a passage, which relates to a repetition.
When 'my sister' noun phrase has already been used in a sentence, then in such case, a pronoun 'her' will best suit the next sentence, which describes about how fantastic her wedding was. It is the only appropriate pronoun from the choices given above.
Therefore, the option B holds true regarding the significance of a pronoun.
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