Always write ___ Blue ink.

A. by

B. in

C. with

D. through

Write in

Always Write In blue ink is the RIGHT option here. Yeah, we can also say that Always Write IN blue ink WITH a black pen.

When it comes to English prepositions there are no hard and fast rules.

Fill IN the application

Fill OUT the application

We can use any preposition here. They mean the same and both are correct.

When you refer to the marks you make on paper blackboard and so on you use IN.

When you want to refer to the writing instrument you are compelled to use WITH.

Always in blue ink with a black fountain pen.

Source

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