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

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.

Read the excerpt from part 3 of the call of the wild. but it was in giving the law and making his mates live up to it, that buck excelled. dave and sol-leks did not mind the change in leadership. it was none of their business. their business was to toil, and toil mightily, in the traces. so long as that were not interfered with, they did not care what happened. billee, the good-natured, could lead for all they cared, so long as he kept order. the rest of the team, however, had grown unruly during the last days of spitz, and their surprise was great now that buck proceeded to lick them into shape. what theme is most supported by the ideas in this excerpt? good leaders are strong and intelligent. loyalty can be a very powerful force. only the strong survive in the wilderness. we are all ruled by our natural instincts.