Answer: A. Usability testing
Explanation:
Usability testing would be the correct answer because if the user interface isn't "frendly" then people won't be able to use it properly. Or if you are refering to the word friendly as looking safe, then even more so would be usability testing. Because if people don't like the fonts and styles of the user interface, they might not use it at all.
OPTION A would be the answer
(My opinion) Naruto! (then Boruto is on it's way to becoming good)
but other people might say my hero academia or any of the dragon ball saga
