Just was curious why the FCC site still appears to show options.
Those aren't options, just an explanation of the call sign system. As the text above the table states, "When the call signs in any regional-group list are exhausted, the selection is made from the next lower group."
And to expand a bit on that, when the FCC implemented the current callsign system in the late 1970s, they structured it in a way that the only calls that would be issued sequentially were callsign blocks that had never before been issued, to ensure that there wouldn't be reissues. (This was explicitly announced way back then.) That eliminated the 1x2 calls in Group A, for example; so they issued 2x1 calls until they were gone and then moved to A 2x2s. None of the Group B call blocks had been used before, so all were available. In Group C, W and K 1x3s were issued long ago, so only the N 1x3s were issued (sequentially). And in Group D, W 2x3s had been issued so only K 2x3s were issued. (The "available" blocks for each Group used to be denoted with asterisks, but I guess those are gone now.)
What you call "options" are (as KG6AF points out) just an explanation of the group structure. This is important to state because the vanity callsign page refers to this table to discuss which classes of license are eligible for which callsign groups. And though FCC won't issue previously-issued blocks sequentially, they will
issue vacant callsigns under the vanity program.