Thank you for the opportunity to help you with your question!
r = n^2a0/Z
HERE r =?, n = 9, a0 = 0.0529*10^-9m( bohr radius), z = 1
Hence, r = 9^2*0.0529*10^-9/1 = 4.2849*10^-9m
Hence, 1 is correct alternative.
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