When is the President's rule imposed in a state​

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Imposition in states
In practice, President's rule has been imposed in a state under any one of the following different circumstances: A state legislature is unable to elect a leader as chief minister for a time prescribed by the Governor of that state, at the Will of Governor.

Ais the

Bmust be the answer, as technically all organs move, so a is incorrect. all organs are made of different types of cells, so that isn’t a problem, so c is also incorrect. human hearts are very similar to many other animals’ hearts, so d is also incorrect, yet the heart is made of muscle, which is hard to grow in the lab so it would be correct to say b