Which excerpt from Extremely Loud and Incredibly Close reveals a childish tone?

A. Need some more copies?” Walt asked. I gave him a high-five, and I showed him the key that I had found, and asked him what he could tell me about it.

B. “Could be a safe-deposit box, actually. An old one. Or some kind of fire-rtrdant cabinet.” That made me crack up a little, even though I know there’s nothing funny about being a mental rtrd.

C, “Well, hardly anyone uses keys anymore.” “I use keys,” I told him, and I showed him my apartment key. “I know you do,” he said.

D. I said, “I have another question.” “Shoot.” “Do you think I could find the company that made this key?” “Anyone could’ve made it.” “Well then, what I want to know is how can I find the lock that it opens?”

B. “Could be a safe-deposit box, actually. An old one. Or some kind of fire-rtrdant cabinet.” That made me crack up a little, even though I know there’s nothing funny about being a mental rtrd."

Explanation:

The line "That made me crack up a little" is indicative of a childish tone along with the rest of that whole sentence.

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explanation:

the answer is:  

he is voicing feelings shared by all humans regardless of race.

in paul laurence dunbar's poem "we wear the mask," he replicates the words mask and we to emphasize how people in general -not just black americans- hide their true feelings. he suggests the masks cover people's faces and eyes, which are the main parts that display their emotions. he also thinks people's pain conceal behind those masks, so that they cannot see reality and nobody is able to see one another's sorrow.