99% of people use this idiom wrong

This idiom is used to describe the situation of a person who is doing a job alone, without any help or support. Surely many people have used this idiom, but are you using it correctly?

Which is the correct idiom?

In your opinion, is the answer “Solo” or “Solo” correct? Write it down in the comment box below so everyone can know.

Trung Temple

Source: https://vtc.vn/99-nguoi-dung-sai-cau-thanh-ngu-nay-ar836097.html