Heyy there! I am AncientEnigma29 and I will be answering your question :)
<h3>#9</h3>
Get good chair, that <u>s</u><u>upports</u> your lower back and is adjustable.
- <em>Option</em><em> </em><em>A</em>
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<h3>#12</h3>
The position the monitor at, or just below, <u>eye</u><u> </u><u>level</u><u>.</u>
- <em>Option</em><em> </em><em>C</em><em> </em>
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<h3>#13</h3>
You should sit at arm’s length <u>on</u><u> </u><u>the</u><u> </u><u>floor</u> from the front the front of the monitor
- <em>Option</em><em> </em><em>A</em>