Answer:
Option B, Ruth and Ramona, identical twins
Explanations -
Identical twins have originated from the same gene and hence they have similar biological characteristics. However with time, changes in behaviour are seen due to change in environment and culture in which they grow up. Most of the identical twins even have the same sex.
Temperaments in identical twins will show greatest care similarity as these individuals share the same genome.
Hence, option B is correct.
