This is a question with answer options. Goal: How to fix an armrest to a chair?

Which of the following methods is more reasonable for accomplishing this goal?

Choices: (a). Design an L shaped wooden structure of required size and fix it on to the chair by nailing it in.; (b). Design an L shaped wooden structure of required size and fix it on to the chair by welding it in.;...I think the answer is
(a).