D) Sisters-in-laws'
The reasoning for this is because when a noun that is possessive is plural, the apostrophe is placed after the "s". When a noun that is possessive is singular, the apostrophe is then placed before the "s".
A, because it isn’t comparing anything, it’s not in chronological order or it would say ‘first, next, etc,’ it isn’t problem and solution because well, there wasn’t a solution to the Titanic accident, so that leaves it to be A.
I say d--------------------------
I believe it would be C, is sometimes referred to as flat time
