Studying is correct.
Studying is the correct spelling.
The latter Studying. Words that end in "Y" typically retain the "Y" when turning themselves into a verb.
It's studying
Studying
Studying
It's studying ! I'm sure about that
It is spell studying.
Studying
In studying I thought you drop the y and add ing
Of course, studying
Yeah, studying is the one to use. If my answer makes any sense now :) )
Studying is the correct spell
Studying is the correct way to spell it.