I got the answer choice right the first time, but after listening to this lesson I realized how attractive answer choice D could be...

09：46

My thoughts exactly.

Studying at home/dorm is the best way to go, but nonetheless I still get distracted (slightly worried that I might have ADHD lol). I saved up for Sony's MDR-1000x and it was the best decision of my life. The noise-cancelling works wonders for me thus increasing my ability to focus on PT.