Distance from curve to origin in R3.?

Find the minimum distance from the origin to the curve 3x^2 + 4xy +3y^2 = 20

A) 1
B) 3sqrt(2)
C) 2
D) 23sqrt(2)
E) 53sqrt(2)

It has been so long since I have done this and I am trying to help my nephew you out but I have completely forgot can someone help
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