Final answer:
The plural of 'el borrador' in Spanish is 'borrador'.
Step-by-step explanation:
The word borrador is already in its plural form. In Spanish, when referring to an object, we add -s to make it plural. However, in some cases, words that end in -r, -l, -n, -d, or -z drop the -s and add -es to form the plural. Since borrador does not end in any of those letters, it remains the same in its plural form as well, which is borrador.
Learn more about Plural forms in Spanish