When a layer of air with temperatures above freezing sits above a layer of subfreezing air near the ground, which type of precipitation is likely to form?
a. rain
b. snow
c. sleet
d. hail

The correct answer is option c, that is, sleet.

Explanation:

Generally, globular transparent ice pellets, which exhibit diameters of 0.2 inches or less, and which get produced as an outcome of the freezing of raindrops or the freezing of the majorly of melted snowflakes is known as sleet.  

The formation of sleet may take place when a warm layer of air is situated above a below-freezing layer of air at the surface of the Earth. In certain parts of the United States and in Great Britain, an amalgamation of snow and rain is known as sleet.  

beta decay is the answer