Try watching this video https://www.youtube.com/watch?v=epZS4ZYbxFU
D
If there isnt more to the question about what A or B is then we cant determine what either of them are.
From the chord theorem we know that:

so:

Answer C.
<span>y=4x-6
y=-4x+48
</span>4x-6= -4x+48
<span>0x=54
x=o</span>