Subjects and verbs must agree in which of the following categories? 1 singular 2 phrase 3 number 4 plural

Plural

Explanation:

When there is more than 1  subject and more  than one verb

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the symbol of the grandfather's heritage in this excerpt from "the medicine bag,” is the beaded bolo tie.

a bolo tie is a cord fastened around the neck with an ornamental clasp which is worn as a necktie. they have been used by native american tribes such as hopi, navajo, zuni, and puebloans since the mid-20th century.

therefore, the fact that the grandfather is wearing a bolo tie refers to his heritage as native american.