Analysing the behaviour of factor f as a function of energy for different tissues of the human body, which of the following statements is correct? ...

Analysing the behaviour of factor f as a function of energy for different tissues of the human body, which of the following statements is correct?

For energies above 0.1 MeV, the f factor for all tissues is approximately equal to 1, indicating that the dose in these tissues is equal to the exposure in air.
The absorbed dose in bone is lower than the KERMA in air for the entire energy range shown in the figure.
For energies below 0.1 MeV, the absorbed dose in fat is higher than the exposure in air.
The f factor for muscle is practically independent of energy due to the similarity of the density of muscle and air.
For energies below 1 MeV, the absorbed dose in bone is higher than in air.
a) Only statements I and IV are correct.
b) Only statements II and V are correct.
c) Only statements III and IV are correct.
d) Only statements I, III, and V are correct.
e) All statements are correct.