Higher order $(> 3)$ reactions are rare due to:

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loss of active species on collisions

increase in entropy and activation energy as more molecules are involved.

shifting of equilibrium towards reactants due to elastic collisions

low probability of simultaneous collision of all the reacting species

answer is A.

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Detailed Solution

For higher order (>3) reactions to occur, 3 or more molecules (having energy equal to or greater than activation energy) must simultaneously collide with proper orientation.
The probability for such collisions is very low. Hence these reactions are rare.

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