In Slavic cosmology, the mortal world distinct from the divine is called Yav.
Yav, also written Jav or Явь, is commonly presented in the modern Prav–Yav–Nav model as the visible, material world: the realm of ordinary human life, physical matter, and present experience. In that three-part scheme, Prav represents divine order or the world of the gods, while Nav is associated with ancestors, spirits, or the otherworld.
The terminology is especially familiar in Slavic Native Faith, or Rodnovery. However, it should not be treated as an uncontested map of pre-Christian Slavic religion. The Book of Veles, one source used to popularize the triad, is widely regarded by scholars as a modern fabrication, and older evidence more securely attests ideas involving Yav and Nav than the complete three-part system.
That historical caution does not change the quiz answer. Within the cosmological vocabulary used by modern Slavic traditions, Yav is the realm of embodied life. A common mix-up is to choose Nav because it sounds like a world beyond ordinary reality; Nav is generally the spirit or ancestral realm instead.