The correct answer is option 'C', which states that the fraction of radiative energy leaving one surface that strikes the other surface is called the view factor.

Explanation:
Radiative energy transfer occurs between two surfaces through the emission, absorption, and reflection of electromagnetic waves. The view factor, denoted as F, quantifies the fraction of radiation leaving one surface that is intercepted by another surface. It is a dimensionless quantity ranging from 0 to 1.

The view factor depends on the geometry, orientation, and relative positions of the surfaces. It represents the geometric configuration factor between the two surfaces and is often used in radiative heat transfer calculations.

The view factor between two surfaces A and B is defined as the ratio of the radiant energy leaving surface A that strikes surface B, to the total radiant energy leaving surface A. Mathematically, it can be expressed as:

F_AB = E_AB / E_A

Where:
F_AB is the view factor from surface A to surface B,
E_AB is the radiant energy leaving surface A that strikes surface B, and
E_A is the total radiant energy leaving surface A.

The view factor is an important parameter in various heat transfer applications, such as radiation heat exchange between surfaces, design of radiation shields, and estimation of radiative heat transfer in furnaces and boilers.

Some key points about the view factor are:
- The view factor is a function of the geometry and shape of the surfaces involved. It can be calculated analytically for simple geometries, but for complex geometries, numerical methods or experimental measurements are often employed.
- The view factor is reciprocal, meaning that F_AB = F_BA. This implies that the view factor from surface A to surface B is the same as the view factor from surface B to surface A.
- The sum of view factors for a surface with respect to all other surfaces in a system is always unity, i.e., ∑F_Ai = 1, where Ai represents all the other surfaces in the system.

In summary, the view factor represents the fraction of radiative energy leaving one surface that strikes another surface and is an important parameter in radiative heat transfer calculations.