For this case, what you should keep in mind is the use of the correct possessive pronoun.
For example, for the second person singular, the correct possessive pronoun is:
tú - Tuyo(a)
Therefore, the equivalent sentence in Spanish for "tu cepillo" is:
el cepillo tuyo
Answer:
the long form of "tu cepillo" is:
D. el cepillo tuyo
