All of the following are singular subject pronouns, except: A. Ella B. Vosotros C. Yo

B

In Spanish, "Ella" translates to "She" and is a singular subject pronoun. "Yo" translates to "I" and is also a singular subject pronoun. However, "Vosotros" translates to "You all" in English and is a plural subject pronoun used primarily in Spain. Therefore, the option B "Vosotros" is not a singular subject pronoun.