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1+4+21+16=\sqrt{1+{\sqrt{4+\sqrt{{21}+{\sqrt{16}}}}}}=

A4

B2

C3

D6

Answer:

B. 2

Read Explanation:

1+4+21+16\sqrt{1+{\sqrt{4+\sqrt{{21}+{\sqrt{16}}}}}}

=1+4+25=1+9=4=2=\sqrt{1+{\sqrt{4+\sqrt{{25}}}}}=\sqrt{1+{\sqrt{9}}}=\sqrt4=2

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