John Bransford and colleagues (1972) designed a study to investigate how readily subjects detected slight changes in nearly-identical sentences that were presented to subjects with a time lag. Their results demonstrated thata. participants detected changes in the specific forms of sentences more often than changes in the mental models they evoked.b. participants detected changes more often if the two sentence evoked different mental models.c. memory for syntax is more stable over time than memory for meaning.d. memory for the content of mental models is just as stable over time as memory for syntactic forms.