The correct thing is to use the verb "sit" to complete the sentence shown in the question above.
We know that the term "glass figurine" refers to an inanimate object and therefore has the pronoun "it" representing it. This means that it is correct to use the verb "sits" to refer to the pronoun "it" and its representatives.
However, the sentence shown in the question above presents the term "glass figurines," in the plural, referring to more than one glass figurine. The pronoun "it" refers to the term in the singular, and in the plural this term is represented by the pronoun "they."
In this case, the correct way to use the verb is "sit," since "sits" is only used in the pronouns "she," "he," it.
It is important to remember that the functions of a pronoun are:
You can find out more about what a pronoun is at the link below:
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