What is the real name the elderly gentleman takes at the beginning of Cervantes' novel before becoming Don Quixote?

• A Alonso de Avellaneda
• B Rodrigo de Cervantes
• C Alonso Quijano ✓
• D Sancho Carrasco

The protagonist is introduced as Alonso Quijano (or Quijada/Quesada in different passages) before his obsessive reading of chivalric romances drives him to become Don Quixote.