The line 3x-2y=k meets the circle x^2+y^...

The line `3x-2y=k` meets the circle `x^2+y^2=4r^2` at only one point, if `k^2` is

A

`20r^2`

B

`52r^2`

C

`52/9r^2`

D

`20/9r^2`

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