Which of the following sentences do not use the semicolon correctly?

question 15 options:

arnold and betsy hurried to feed the pigs; a huge storm was coming.

the pigs were still out in the field; therefore, betsy and arnold had to corral them into the barn for safety.

after feeding the pigs; betsy and arnold were caught in a downpour.

as they ran back to the house, betsy and arnold laughed that the pigs were safe but they were caught in the storm; it was truly an adventure.