The correct option is A Platitude
'A common place remark' is called Option B, 'Platitude'. Option A, 'Dialogue' is a conversation between two people in a book or a film. Option C, 'Epigram' is a short poem which expresses an idea in a clever, funny way. Option D, 'Statement' means a declaration. Thus, options A, C and D are incorrect and the correct word for the given phrase is Option B, Platitude.