$\underset{I}{\underline{\text{While trying to collect}}} \text{ an envelop } \underset{II}{\underline{\text{from the table, }}} \underset{III}{\underline{\text{Mr.X fell down}}} \text{ and} \underset{IV}{\underline{\text{was losing consciousness}}}$

Which one of the above underlined parts of the sentence is NOT appropriate?

1. $I$
2. $II$
3. $III$
4. $IV$

edited