Which one of the following is associated with "albedo"

1. A

   Transmitting power

   (a) Transmitting power. Transmittance is the fraction that passes through; albedo is not transmission.

2. B

   Absorbing power

   (b) Absorbing power. Absorptivity is the complementary idea; a high-albedo surface absorbs little.

3. C

   Emissive power

   (c) Emissive power. Emission (Stefan–Boltzmann) is outgoing thermal radiation, not the reflected fraction of incoming sunlight.

4. D

   Reflecting power

   (d) Reflecting power. Albedo is the fraction of incident radiation reflected by a surface (Earth ~0.3). (d) Official key.

Summary. Official key is (d). Albedo means reflecting power. Transmission, absorption and emission are the other radiometric neighbours.