What was one of the main reasons that large numbers of irish moved to the united states in the 1840s? there was a widespread outbreak of the flu virus in ireland. there was a war going on at that time in ireland. ireland’s potato crop failed due to a disease. ireland was very overpopulated at that time.

the answer to your question is Ireland's  potato crops failed due to a disease

The answer is C.

This is because Ireland had a bad potato crop which failed due to disease.

If brainliest is available, I would be very happy to receive it. Thanks.

worldwide, 780 million people do not have access to an improved water source. an estimated 2.5 billion people lack access to improved sanitation (more than 35% of the world's population)

did you check the study guide?