The stage of demographic transition that comprises high fertility and high mortality is the first stage.

First Stage of Demographic Transition:

High Birth Rate: In the first stage, birth rates are high due to various factors, including lack of family planning, limited access to contraception, and cultural and societal norms that favor larger families. High birth rates result in a rapidly growing population.

High Death Rate: Simultaneously, the death rate is also high during this stage. This is primarily because of limited access to healthcare, high infant mortality, and prevalence of infectious diseases. People, particularly infants and children, have a higher likelihood of succumbing to diseases and poor living conditions.

Slow Population Growth: While both birth and death rates are high, they somewhat balance each other out, resulting in a relatively slow population growth rate. This stage represents a time when population size is not increasing significantly due to the offsetting effects of high birth and death rates.

THEREFORE THE CORRECT OPTION IS [1].