Janelle runs a garment manufacturing business. Her employees sew together fabric that has been cut to be assembled into garments. She has studied how many garments her employees produce per hour and has determined that the average worker produces ten garments per hour. Yael also has a garment manufacturing business. Her business produces garments that are quite similar to those made by Janelle's business. Yael's workers can sew $12$ garments per hour. Which of the following is true about these businesses?

A$.$ Yael's employees are harder working than Janelle's employees.

B$.$ Yael's business has greater productivity than Janelle's business.

C$.$ Janelle's employees have difficulty assembling the garments.

D$.$ Janelle's operations managers are not as effective as Yael's operations managers.

E$.$ Yael's employees are less productive than Janelle's.