Which of the following Veda deals with "spells and incantations"?

Atharvaveda

The correct answer is Option 4- Atharvaveda

The Veda that deals with spells and incantations is the Atharvaveda.

The Atharvaveda is the youngest of the four Vedas, and is dated to around 600-200 BCE. It is a collection of spells, incantations, and other magical formulas, meant to be pronounced by the person who seeks some benefit, or more often by a sorcerer who would say it on his or her behalf.

The Vedas comprise four major collections:

Rigveda: A collection of hymns praising various deities.
Samaveda: A collection of melodies used in rituals.
Yajurveda: A collection of formulas used by priests during rituals.
Atharvaveda: A collection of spells and charms for various purposes.