Correct option is C
M3 sits to the immediate right of M5:
M5, M3
M3 is second to the left of M1:
M5, M3, _, M1
M4 is second to the right of M2:
M5, M3, M2, M1, M4
M5 is not sitting at the ends of the row:
M6, M5, M3, M2, M1, M4
M6 and M4 are sitting at the ends of the row.