Option A is the correct answer because the verb used is correct because the idiom how’s it going is another way to say how are you, how are things progressing, or what’s up. The ‘it’ refer to life in general, a project, or your day.
Option D is incorrect because gomecon isn’t the past tense of going and the question is in the present tense.
Option B is incorrect because ‘how does it go on’ means asking how a particular action is performed or how something is done, but that doesn’t make sense in the question.
Option C is incorrect because ‘is’ is the third person singular for ‘be’ and hence it is to be placed before it, as it a question.
In a statement, it is going is correct. But in a question, is it going is correct.