What term refers double meanings in a text?

How are Wagner's Leitmotif ideas developed in musical ways?

a) in similar ways to the themes of a sonata-form movement b) using ritornello principle c) through declamatory recitative d) using pervading heterophony

A great achievement of the Les Très Riches Heures was that it made manuscripts more closely resemble ____

a. ephemeral decorations b. murals c. polychromed sculpture d. panel paintings