What architectural feature is the main pyramid at Chichen Itza famous for, where the setting sun on the equinox creates the illusion of a serpent slithering down the staircase?

• A El Templo
• B El Castillo ✓
• C El Palacio
• D El Convento

El Castillo (the Castle) at Chichen Itza displays the serpent-shadow effect during the spring and autumn equinoxes.