Process by which water vapor changes to a liquid
evaporation
condensation
convection
radiation

The correct answer to the question is B) Condensation.

EXPLANATION:

Before coming into any conclusion, first we have to understand various phase changes.

There are various phase changes in which matter in one state is converted into matter in another state.

Evaporation: Evaporation is the thermal process of state change in which a liquid is converted into corresponding vapor state.

For instance, water to steam or vapor.

Condensation: Condensation is just the opposite process of evaporation. In this process, a substance in vapor phase is converted into liquid phase.

For instance, water vapor to liquid water.

The two processes that is Convection and radiation mentioned in the question are not phase changes. These two are different modes of heat transfer between substances.

Hence, the process by which water vapor changes to a liquid is called condensation.

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia