Which is the adjective phrase in the sentence? in my school, students are using a new series of textbooks.
a. of textbooks
b. in my school
c. a new series

The correct option is option C. The hand-painted doll was worth thousands of dollars.

Explanation:

A hyphen (-) is commonly defined as a punctuation mark used to join words or parts of words. They usually come before the word that they are modifying.

Bearing in mind the described above, it could be said that from the options provided the sentence which correctly uses a hyphen is option C. The hand-painted doll was worth thousands of dollars. Since it comes before the word doll which is the one that is being modified by hand-painted.