Choose the correct statement with respect to photosynthesis.

During ${\mathrm{C}}_4$ cycle, in bundle sheath cells, ${\mathrm{C}}_4$ acids such as Malic acid or Aspartic acid are subjected to decarboxylation and the released ${\mathrm{CO}}_2$ is accepted by RUBP to form phosphoglyceric acid. Law of limiting factors was proposed by Blackman. ${\mathrm{C}}_3$ plants are less efficient than ${\mathrm{C}}_4$ plants such as Maize and Sorghum.