Marie curie contributed to society by
a. creating an effective steam engine
b. pioneering research on radioactivity
c. discovering vaccination and microbial fermentation
d. developing the general theory of relativity

The correct answer is B. Marie Curie contributed to society by pioneering research on radioactivity.

Explanation:

Her achievements include the first studies on the phenomenon of radioactivity (a term that she coined herself), techniques for the isolation of radioactive isotopes and the discovery of two elements, polonium and radium. Under her direction, the first studies in the treatment of neoplasms with radioactive isotopes were carried out. She founded the Curie Institute in Paris and in Warsaw, which remain among the main centers of medical research today. During World War I, she created the first radiological centers for military use. She died in 1934 at the age of 66, at Sancellemoz sanatorium in Passy, due to aplastic anemia caused by exposure to radiation from test tubes with radio that she kept in her pockets at work and in the construction of mobile X-rays units of the First World War.

must repent and believe in god.

or the book

journey across time - chapter 10 "the rise of christianity"