The only option is to toss the results and prohibit certification of the election. That would force the legislature to pick electors.
This is one of the options asked for. There are some alternatives suggested though.
Accordingly, Plaintiffs seek an emergency order prohibiting Defendants from certifying the results of the General Election. In the alternative, Plaintiffs seek an emergency order prohibiting Defendants from certifying any results from the General Election that included the tabulation of absentee and mail- in ballots which do not comply with the Election Code, including, without limitation, the tabulation of absentee and mail-in ballots Trump Campaign’s watchers were prevented from observing or based on the tabulation of invalidly cast absentee and mail-in ballots which (i) lack a secrecy envelope, or contain on that envelope any text, mark, or symbol which reveals the elector’s identity, political affiliation, or candidate preference, (ii) do not include on the outside envelope a completed declaration that is dated and signed by the elector, or (iii) are delivered in-person by third parties for non-disabled voters. Lastly and in addition to the alternative requests for relief, Plaintiffs seek a permanent injunction requiring the County Election Boards to invalidate ballots cast by voters who were notified and given an opportunity to cure their invalidly cast mail-in ballot.
This is one of the options asked for. There are some alternatives suggested though.