The answer is c because if you have a square and you look at a reflection you can see that a square has 4 sides so if you look at the reflection you would see another of the square. So what you would do is 4+4 which equals to 8.
43 items are being purchased.
Work:
49 - 6 = 43
43 items left!
Hope this helps!

Therefore, the diameter is twice of that:
52 centimeters.