Answer:
Leo (or D).
Explanation:
Yo is the "I" form, which means that out of the conjugations for "leer", "leo" would be the right one. The chart is as follows:
Yo : Leo
Tu : Lees
El / Ella / Usted : Lee
Nosotros : Leemos
Vosotros : Leéis
Ellos / Ellas / Ustedes : Leen
