Fill in the blanks with correct option
Please sign these documents ______ ink so that they can be preserved .

Options

A. i) with
B. ii) by
C. iii) from
D. iv) in

Explanation

Please sign these documents in ink When you refer to the marks you make on paper you use IN. When you want to refer to the writing instrument, use WITH.
Eg: I wrote this IN blue ink WITH a fountain pen.