A quarter note plus a quarter note plus a quarter note equals three quarter notes. In music, this typically translates to one whole note (which is equivalent to two quarter notes) plus one additional quarter note, which together equals a dotted half note.
So, in terms of notation, the answer would likely be represented as a dotted half note, as it extends the duration to three beats (a half note (2 beats) plus a dot (adding 1 beat)).
If you have an option for a "dotted half note," that would be the correct response.