Three students, X, Y, and Z, are enrolled in an English course. To evaluate these students, the teacher chose to give five tests. In order to pass this course, the student must have an arithmetic mean of the grades from the five tests greater than or equal to 6. The table shows the grades each student received on each test.
| Student | $\mathbf{1}^{\mathbf{st}}$ | $\mathbf{2}^{\mathbf{nd}}$ | $\mathbf{3}^{\mathbf{rd}}$ | $\mathbf{4}^{\mathbf{th}}$ | $\mathbf{5}^{\mathbf{th}}$ |
| X | 5 | 5 | 5 | 10 | 6 |
| Y | 4 | 9 | 3 | 9 | 5 |
| Z | 5 | 5 | 8 | 5 | 6 |
Based on the data in the table and the information given, will be/will fail
(A) only student Y.
(B) only student Z.
(C) only students X and Y.
(D) only students X and Z.
(E) students X, Y, and Z.