The character that can be acquired but not inherited is b. size of body.
Explanation: Eye color, skin color, and nature of hair are determined by genetics and are passed down from parents to offspring, making them inherited traits. Body size, however, can change throughout a person’s life due to factors like diet and exercise, and is not genetically determined.
Why other options are incorrect:
a. Color of eye: Eye color is determined by genes and is passed down from parents.
c. Color of skin: Skin color is also determined by genetics and is inherited.
d. Nature of hair: Hair characteristics like color and texture are influenced by genes and are therefore inherited.