In the interrogative sentence "What makes someone live alone for so much time?", the auxiliar verb

In the interrogative sentence "What makes someone live alone for so much time?", the auxiliar verb DOES wasn't used because:

a

There was a grammatical mistake.

b

It is optional in this case.

c

There is another verb immediately after the object.

d

What is the subject of the clause.

e

The question is informal

Próxima Questão