Answer:
b. $268.14
Explanation:
Original credit card monthly payment =

where
Principal= $4350
i= 19/12/100=0.01583
n= 8
Putting the values in formula we get:

We get A1= $583.19
Now, she paid $2000 making new principle = $2350
i and n are same.

We get A2=315.06
Difference between A1 and A2=

Therefore, June lowered her minimum monthly payment by $268.13 close to option B.
Hence, option B is correct.