While trying to collect (I) an envelope from under the table (II), Mr. X fell down and (III) was losing consciousness (IV)Which one of the above-underlined parts of the sentence is NOT appropriate?

While trying to collect (I) an envelope from under the table (II),

1.	While trying to collect (I) an envelope from under the table (II), Mr. X fell down and (III) was losing consciousness (IV)Which one of the above-underlined parts of the sentence is NOT appropriate?
A.	I
B.	II
C.	III
D.	IV
Answer» E.