Can some one help me answer this question plz

I'm taking a class on how to make a movie, and it offers some apps that would be in the process. the thing is, i don't have any of those ha. if you have any tips on some apps i could use, that would be awesome. i don't have an iphone, so don't suggest any apps like imovie. i know that this is a weird question, but it would be super for me. : )

How should you specify box sizes on a web page if you want the boxes to vary according to the font size of the text they contain? a. in pixels b. in inches c. as percentages d. in em units

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