Please I need 1 line explanation for each answer

Medro and Mariana have been doing really well financially and wanted to invest their money into something beneficial. So, they decided to open (M&M)'s Little Chef School in their coffee shop that graduates students with a basic chef degree in making healthy sandwiches. The healthy sandwich week course is 5 days long from Saturday to Wednesday. There are 4 teachers. The school operates 2 hours each day from Saturday to Wednesday. Each teacher is paid 7 KD/hr. The materials needed to teach each student will cost (M&M) 8 KD/student. They will charge 60 KD per student for the course. During the first week (Saturday to Wednesday) of opening the school, 24 students graduated. 19. Medro & Mariana computed the teacher- productivity for the first week. They did not like the result. So, they said: "the labor-productivity for week 2 must equal 6". They want to increase this productivity by increasing the number of students who will graduate from the course. How many students must graduate from the course to be able to achieve a labor-productivity = 6? = O a. 14 students O b. 30 students O c. 28 students O d. none of the above