How is the following passage from a cause-and-effect essay organized?


After the dog had puppies, the mother became ill and could not nurse them, so we had to prepare bottles of milk every two hours. First, we had to get the right type of formula from the pet store. Second, we had to heat the formula according to the veterinarian’s instructions.

A.
point by point
B.
by chronological order

C.
subject by subject

D.
by order of importance