26) C

Let us look at the possible combinations:

M     N     P      ( )        ( )        O  : First possibility of seats vacant next to each other

O     ( )     ( )      P        N        M  : Second possibility of seats vacant next to each other

M     N     ( )      P        ( )        O  : No seats vacant next to each other

O     ( )     P      ( )        N        M  : No seats vacant next to each other

Total number of combinations = 4
Number of possibilities in which there are 2 seats vacant next to each other = 2
Probability = 2/4 = 1/2

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