Classification

As per the options,

(a) $S \xrightarrow{-1} R \xrightarrow{+5} W \xrightarrow{+1} X$

(b) $\mathrm{H}^{-1} \mathrm{G} \xrightarrow{+5} \mathrm{~L} \xrightarrow{+1} \mathrm{M}$

(c) $\mathrm{P} \xrightarrow{-1} \mathrm{O} \xrightarrow{+5} \mathrm{~T} \xrightarrow{+1} \mathrm{U}$

The answer is Option C: Pigeon.

Here's why:

The cassowary, emu, and ostrich are all large, flightless birds.

The pigeon, on the other hand, is a bird that can fly and is much smaller.

Thus, the pigeon is the one that is different from the others.

Chandigarh is the capital of two states Haryana and Punjab.

$\therefore$ Chandigarh is different from others.

As, $B\buildrel { - 1} \over \longrightarrow A\buildrel { + 3} \over \longrightarrow D\buildrel { - 1} \over \longrightarrow C$

$J\buildrel { - 1} \over \longrightarrow I\buildrel { + 3} \over \longrightarrow L\buildrel { - 1} \over \longrightarrow K$

$N\buildrel { - 1} \over \longrightarrow M\buildrel { + 3} \over \longrightarrow P\buildrel { - 1} \over \longrightarrow O$

But, $V\buildrel { - 1} \over \longrightarrow U\buildrel { + 2} \over \longrightarrow W\buildrel { + 1} \over \longrightarrow X$

Except option (d), all others follow same pattern ($-$1, +3, $-$1).