The order which is william is using is chronological order, as he arranging a data in an order pros to owning pets, cons to owning pets, best pets to own.
The meaning of chronological is arranged in the direction it happened.
For example of chronological is a bio that begins in 1920 and goes through 1997.
In direction of time from the most earlier to the recent.
Thus, option "B" is correct, chronological order.
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