A spontaneous process is defined as a process which

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Takes place instantaneously

Takes place by itself or by initiation.

Needs some initiation like heat, electricity etc.

Takes place by itself

answer is B.

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Detailed Solution

In thermodynamics, a spontaneous process is a process which occurs without any external input to the system. A more technical definition is the time-evolution of a system in which it releases free energy, and it moves to a lower, more thermodynamically stable energy state (closer to thermodynamic equilibrium).
A spontaneous process may take place on its own or by initiation;
It need not be instantaneous always

Hence the correct answer is (B) takes place by itself.

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