It gives comic relief, probably.
A is the answer. B has a 'plural verb' and a singular subject, as does C. D has a plural subject and 'singular verb'
Answer:
The 19th century saw large amounts of social change; slavery was abolished, and the First and Second Industrial Revolutions (which also overlap with the 18th and 20th centuries, respectively) led to massive urbanization and much higher levels of productivity, profit and prosperity.
Explanation:
