Question

Please read the guidelines before filling ___ application form.

a. a
b. in the
c. out an

Answer 1

Answer:

Please read the guidelines before filling the application form.

Answer 2

Correct option to fill is - b. in the

The complete statement that will form is - Please read the guidelines before filling in the application form.

Since the statement refers to a particular form to be filled, the word "the" will be used.

Else, fill in and fill out, both the words are commonly used with the application form.