Assuming that the market is in weak form of efficiency, which type of information should not predict future return?

Question $8$ options:

Fed chair's undisclosed deliberation of next rate move

Insider knowledge about next quarter's return

Valuation ratio, like price$-$to$-$earnings ratio

Momentum signal, calculated by aggregating the past $6-$month stock return

Undisclosed information about last year's serious accounting issue