Given is a diagram representing the annual mean temperature and the annual mean precipitation in three biomes $\mathbf{P}, \mathbf{Q}$ and $\mathbf{R}$ on the planet. All the animals living in these biomes together can be largely grouped into two major classes 'Regulators' and 'Conformers'. Regulators are the animals that can regulate their body temperature and Conformers are those animals whose body temperature changes as per the environmental temperature. Assuming that these animals do not have any specialised adaptations, the correct statement would be ____.

• A

  Regulators tend to have a large body size in $\mathbf{P}$, whereas they tend to have a small body size in R
• Correct answer
  B

  Regulators with both large and small body size can be found in P , but only those with large body size can be found in $\mathbf{R}$
• C

  Conformers with large body size do not survive in P , but can only do so in Q
• D

  Conformers with large body size do not survive in Q, but can only do so in R

Hence, the correct answer is option: 'B'.