Aballad is usually
a. linguistically formal.
b. recited by a chorus.
c. performed by several actors.
d. structured in quatrains with rhyming stanzas.

D

Explanation:

A ballad is usually structured in quatrains (four line stanzas) with rhyming stanzas or four poetic lines. The rhythm of each line in a ballad are usually iambic that means they have one unstressed syllable followed by a stressed syllable. Although some ballads may have chorus but that is only after they have been set into music.An example of a ballad is the "rime of the ancient mariner" by Samuel Taylor

artists followed a set of rules to achieve ideal proportion.