Which verb or verb phrase signals an inappropriate shift in mood ?

D. delighted to confirm

Explanation:

This shifts the mood to a happier tone in the paragraph. I'm not positive this is the answer, but I believe I am correct.

Hope this helps.

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.

to show how the cables work.