Given the task definition and input, reply with output. In this task, you will be given a short story. One sentence from the story is chosen. Consider the likely emotions and basic human drives of the participants in that sentence. Does any of these states of mind/feelings motivate the participant to do what happens in that sentence? You should write your answer in the form " A >Motivates> B". Try to use phrases and sentences from the story to compose your answer when possible. For the motivation sentence, you must choose a verb from :feel(s), want(s) or like(s). There will always be some motivation in the given story.

story: The old farmer had two mules and one plow. Both mules like pulling the plow for the farmer. Each day the farmer worried about which mule to used. One morning he saw both mules standing together. He got the idea to hooked both mules to the plow.
 selected sentence: Each day the farmer worried about which mule to used.

Both mules like(s) pulling the plow >Motivates> The farmer worries about which mul to use