Might I suggest (d): analysts, disgusted by the fact this crap is on top, tweaked The Feed in an attempt to disfavor that type of content then ran a simulation

Might I suggest (d): analysts, disgusted by the fact this crap is on top, tweaked The Feed in an attempt to disfavor that type of content then ran a simulation but saw their simulated ad revenue become lower than allowed minimum, then did (a) and went out to have lunch.