This is a question with answer options. Goal: How to make text bold in OneNote

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

Available choices:
(I) Locate the text you wish to make bold, and highlight it. On the top of the screen, click the "B" button to make it bold.
(II) Locate the text you wish to make bold, and highlight it. On the bottom of the screen, click the "U" button to make it bold....I think the answer is
(I)