The fact that energy availability decreases as a food chain gets longer is best explained by which statement? a. much of the energy is used for life processes along the way. b. organisms use almost all the energy they receive. c. there is less biomass at higher trophic levels. d. there are fewer organisms to eat at higher trophic levels.

The correct answer is option(A).

Explanation:

Food chain: Predecessor is eaten by the successor in the food chain

For example:Grass→ deer→Loin

Grass is Predecessor and deer is successor

The energy availability decreases as food chains gets longer because the energy gained by the organism from the predecessor of the food chain gets spend in life processes like: respiration, movement etc. And This lead to lost of energy in the form of heat to the surrounding.

Hence,the correct answer is option (A).