Answer:
A. conduction--molecule-to-molecule heat transfer
Step-by-step explanation:
A. The transfer of energy through a substance. In heat conduction, energy is transferred from molecule to molecule by direct contact; the molecules themselves do not necessarily change position, but simply vibrate more or less quickly against each other.
B. The option said strongly vertical mixing while advection is the transfer of heat or matter by the flow of a fluid, especially horizontally in the atmosphere or the sea.
C. Radiation is not assimilation and conversion. Radiation is the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.
D. Convection is not strongly horizontal mixing. Convection is the transfer of heat by the movement of a fluid (liquid or gas) between areas of different temperature.