"The dagger knew too well that Caesar was designed to be made of paradox."

The sentence is: "The dagger knew too well that Caesar was designed to be murdered." This statement attributes the human ability of "knowing" to an inanimate object, the dagger.

A paradox is a statement that appears self-contradictory but contains a deeper truth. The idea of an inanimate dagger "knowing" is a contradiction. This contradiction serves to emphasize a deeper truth about the inevitability or predetermined nature of Caesar's murder, suggesting that even the instrument of death was aware of its fated role. Therefore, the statement can be interpreted as a paradox.

The correct option is A.
$\boxed{\text{A. paradox}}$