Question

look at the text below. if there is an error with subject-verb agreement, select the incorrect verb and type it correctly. otherwise, submit the text without making any changes. after a landslide caused a gold and silver mine in nicaragua to collapse in 2014, several of the miners was trapped for more than thirty hours before they were rescued.

Explanation:

The subject "several of the miners" is plural (since "several" refers to more than one miner). In subject - verb agreement, a plural subject should take a plural verb. The verb "was" is singular, so it should be replaced with the plural verb "were".

Answer:

After a landslide caused a gold and silver mine in Nicaragua to collapse in 2014,
several of the miners were trapped for more than thirty hours before they were
rescued.