What is the most logical next event?

How to get better at defense in basketball
Get low.
Getting low is very important when playing defense. You want to bend your legs at about a 45 degree angle.

Options:
[a]. But hold your knees up tight and hold them there for a long period of time-thirty seconds. As the ball flies towards you, extend your knees about halfway and move them backwards until they are almost touching.
[b]. Being low helps you shuffle from side to side faster, and when you are bending your knees, your eyes are around your opponents waist, which is very important because then you will know where your player is going. Be on your toes, being on your toes will guarantee success when playing defense.
[c]. The lower your knees, the closer to the foul line. However, don't stretch your lower leg.
[d]. This will prevent you from putting unnecessary pressure on your back as you play offense. The last thing you want is to put undue pressure on you as you play.
[b].