Both "the tiger" and "the lamb" convey similar messages, also called

iambs.
parallelisms.
refrains.
themes.

Themes

The main idea or message in a story is the story's theme. Both "The Tiger" and "The Lamb" have similar themes.

Iambs are types of meter. An iamb is made of two syllables with the first unstressed and the second stressed. Parallelism is the repetition of a similar verb, phrase, or sentence structure. Refrains are phrases or groups of lines repeated throughout the poem.

D) Themes.

Explanation: In literature, the theme is the underlying message of a story, it is  what critical belief about life is the author trying to convey in the writing of a novel, play, short story or poem. Usually this belief, or idea, is universal and transcends cultural barriers. So when we say that "The Tiger" and "The Lamb" convey similar messages, is the same as saying that they have similar themes.

answer; i believe the correct answer is ( indirect characterization);

the answer is clear boy