The rules of statistics say that it is possible for all the air in a room to move to one corner. This is extremely unlikely.

a. |
The rules of statistics say that it is possible for all the air in a room to move to one corner, or this is extremely unlikely. |

b. |
The rules of statistics say that it is possible for all the air in a room to move to one corner, but this is extremely unlikely. |

c. |
This is extremely unlikely in that the rules of statistics say that it is possible for all the air in a room to move to one corner. |

d. |
For all the air in a room to move to one corner, this is extremely unlikely, according to the rules of statistics saying that it is possible. |