The correct option is
A Platitude
Option A is the correct answer because 'platitude' means a statement that has been repeated so often and commonly that it is meaningless or a cliche.
Option B is incorrect as 'remark' a written or spoken comment.
Option C is incorrect because a 'statement' is a declaration or an expression of views/facts.
Neither 'remark' nor 'statement' is a commonplace remark.
Option D is definitely incorrect because it refers to an inscription on a stone or a brief but witty saying.