In the Nineteenth Century, How Did Ireland's Population Grow Despite

In the nineteenth century, how did Ireland's population grow despite extreme poverty?

A) The amount of land a peasant could lease increased with the number of children in his household.
B) Landlords, believing that large families were guarantees of stability, would only lease land to families with at least five children.
C) Extensive cultivation of the humble potato provided sufficient nutrition for population growth.
D) The Industrial Revolution in England created a never-ending source of employment for Ireland's surplus population.