What is wrong with each of the following attempts at motivation?

a. A sales supervisor for an insurance company believes that employees appreciate an opportunity to broaden their experience, so she rewards the top performer each year with an all-expenses-paid leadership seminar. The seminar lasts a week and is conducted at a hotel in a city 200 miles away.

b. The supervisor of a hospital cafeteria awards one employee a $50 bonus each month. To give everyone an equal chance at receiving the bonus, the supervisor draws names written on slips of paper from a jar.

c. A maintenance supervisor in a pickle factory believes that qualified employees should be able to tell whether they are doing a good job. Therefore, the supervisor focuses motivation efforts on thinking up clever rewards to give out each year to the best performers.