Kelvin got his wisdom teeth removed and his mouth is swollen. His doctor tells him to rinse his mouth with a warm saltwater solution every few hours. How does the saltwater solution help heal Kelvin's mouth?

a
The salt water is a hypotonic solution, and the swollen cells in Kelvin's mouth will release water through diffusion.
b
The salt water is a hypotonic solution, and the swollen cells in Kelvin's mouth will take in water through osmosis.
c
The salt water is a hypertonic solution, and the swollen cells in Kelvin's mouth will release water through osmosis.
d
The salt water is a hypertonic solution, and the swollen cells in Kelvin's mouth will take in water through diffusion.

b

The salt water is a hypotonic solution, and the swollen cells in Kelvin's mouth will take in water through osmosis.