Thomas malthus' prediction of mass starvation resulting from diminishing marginal returns has not been fulfilled because

a) Malthus ignored other factors like technological change.

Explanation:

Thomas Malthus (1766-1834) was an English cleric and a scholar, most known for his demographics theory. He is an author of An Essay on the Principle of Population, where he observed that increasing production of food resulted in improved well-being of the population, but this was temporary because it led to a population growth. Larger population led to the restoration of original production per capita.

He was mainly wrong because he did not account for improvement in technology of production. Development and widespread use of technology meant that it is not needed to use the same amount of energy to produce goods. Production increased much faster than the increase of population, which resulted in a failure of his theory.

idk but found this on google

"the kansas-nebraska act allowed each territory to decide the issue of slavery on the basis of popular sovereignty. kansas with slavery would violate the missouri compromise, which had kept the union from falling apart for the last thirty-four years. the missouri compromise had prevented this from happening since 1820."

the technology changed agriculture in an impacting manner since many people left the field work by a cellular or other technological appliances