Which of the following describes a possible cause for a ceiling effect ? a.) A memory test where everyone scored well . b.) A memory test where everyone scored poorly . c.) A memory test where the groups were not tested the on same day d.) A memory test that has known extraneous variables. a.) A memory test where everyone scored well . b.) A memory test where everyone scored poorly . c.) A memory test where the groups were not tested the on same day d.) A memory test that has known extraneous variables..