Which of the following options show parallel construction?
a. “being happy,” “being sad,” and “being depressed”
b. “telling a story,” “being informed,” and “the end”
c. “face the music,” “dancing in the rain,” and “show your stuff”
d. “to get rich,” “getting lazy,” and “being happy”

Parallel construction is when multiple parts of a sentence have the same grammatical structure. Let's analyze these.

FYI: a gerund is a verb used as a noun by adding -ing.
infinitives are the "to _" forms.

a. "Being happy," "Being sad," and "Being depressed"
All of these parts have the same grammatical structure, (gerund-adjective) so it is a parallel construction.

b. "The end" doesn't fit with the other two parts. (it's a noun but not a gerund)

c. "Dancing" doesn't fit with the other two parts. (it's a gerund but not a verb)

d. "To get rich" doesn't fit with the other two parts. (it's an infinitive, not a gerund)

Correct  a

Argumentare apartenenta poeziei pelerinaj sentimental la genul liric