Why is anaerobic respiration considered less efficient than aerobic respiration?

a
Less energy is required during anaerobic respiration than aerobic respiration.
b
More oxygen is required for anaerobic respiration than for aerobic respiration.
c
Less lactic acid is formed during anaerobic respiration than during aerobic respiration.
d
More ATP molecules are gained in aerobic respiration than in anaerobic respiration.

d

More ATP molecules are gained in aerobic respiration than in anaerobic respiration.

In aerobic respiration, glucose is fully broken down in the presence of oxygen to produce a significantly higher amount of ATP compared to anaerobic respiration. Anaerobic respiration only produces a small amount of ATP in the absence of oxygen. Therefore, aerobic respiration is considered more efficient in terms of energy production.