I think its A
In order to paint a rough surface, it is necessary to do X and Y before applying the paint. X and Y needs to be parallel.
X(to sand) and Y(to apply primer) are parallel.
Here "it" properly refers to "rough surface". "It" cannot refer to the verb "paint" ("paint" acts as a verb here).
There are only 2things X and Y to be done before applying the paint.
B, C and E changes the meaning. They list 3 things to be done..
D is wordy.
OA?
In order to paint a rough surface, it is necessary to do X and Y before applying the paint. X and Y needs to be parallel.
X(to sand) and Y(to apply primer) are parallel.
Here "it" properly refers to "rough surface". "It" cannot refer to the verb "paint" ("paint" acts as a verb here).
There are only 2things X and Y to be done before applying the paint.
B, C and E changes the meaning. They list 3 things to be done..
D is wordy.
OA?












