Employees accepted into the program - for which the application proces

I have one question about the correct answer D
practicing active listening skills and learning
here in d practicing is parallel to learning but what how practicing is parallel to non underline part.
Somebody please give detailed analysis of the correct answer

Practicing and learning are telling us what they are doing while attending several workshops. So, it is modifying the entire clause.

Remember he rule of ", ing"? Just link this sentence with that rule, you will understand better.

Employees accepted into the program - for which the application process is long and arduous - attend several workshops aimed at what the company calls emotional intelligence, practice active listening skills, and they learn how to provide easily-digestible constructive criticism.

One more practice question-involving parallelism of participle modifiers.

A. practice active listening skills, and they learn --- the verb 'practice' does not gel with the noun in the first part and with the IC after 'and'

B. they practice active listening skills and learn -- This is a comma splice

C. practicing active listening skills, and at learning --'at learning' mars the symmetry of parallelism.

D. practicing active listening skills and learning -- the best

E. at practicing active listening skills and learning -- same error as in C

Only C and D are feasible.
The parallelism in C is not good.

VERITAS PREP OFFICIAL EXPLANATION:

In correct answer choice D, the verbs "practicing" and "learning" form parallel components of a participial modifier, describing what happens when the employees attend the workshops. And this is logical: active listening and providing feedback are components of emotional intelligence, and the sentence could very easily end right after "intelligence." This is unnecessary but helpful description, perfectly performing the role of a modifier. To see that this correct, use slash-and-burn to create a much simpler sentence:

"Employees attend workshops, practicing x and learning y."

Choice A bungles its attempt at making a three-verb series ("attend, practice, and learn"), adding "they" to the third item when the second does not have a subject.

Choice B essentially commits the same error, just reversing the placement of the single "they" this time before the second verb but not the third.

The "at" in choice C is similarly problematic: if the meetings are aimed at two things ("at what the company calls..." and "at learning..."), those two things aren't parallel (one is a noun and the other a verb), and if the verbs are to be parallel (as A and B seem to try to do) then the term "at" breaks up the series.

Choice E is guilty of an error with the placement of "at" as well: "at" could work to connect two parallel things that the meetings are aimed at, but would need to be connected by the word "and" which is missing here.

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