The correct answer is C. Yesterday
Step-by-step explanation
Alfred Jules Ayer (1910 - 1989) was a philosopher of English nationality who promoted the philosophical ideas of logical positivism and philosophical expressivism. This current of thought focused on the study of the meaning of moral language. Therefore, expressivism studies sentences that include moral concepts, because they argue those moral concepts do not express reality but rather express an evaluative attitude towards an object, that is, they are not true but can be considered just as an opinion.