Re: ...
(c) People who have discovered it's much easier to skive off when working at home and are loath to see management remember the downsides, and thus make the WFH option go away.
(d) Introverts who have discovered they can work far more effectively when out of the office, and really, really don't want the WFH option to go away.
(d) Statistical noise.
(e) All of the above.
Humans being human, I tend towards option (e).