which thesis statement is strong because it demonstrates confidence? a.) i feel that the unsanitary living conditions of the urban poor in the early 20th century contributed to the high infant mortality rate of the time. b.) the main reasons for the high infant mortality rate in the early 20th century were government corruption and unsanitary housing. c.) i believe that the infant mortality rate in the early 20th century was negatively affected by overcrowding in cities and a lack of access to healthcare. d.) it's possible that if city governments had better enforced existing housing and sanitation laws in the early 20th century, the infant mortality rate would have been lower.