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Sodium borate on reaction with conc. H2 ...

Sodium borate on reaction with conc. `H_2 SO_4` and `C_2 H_5 OH` gives a compound A which burns with a green edged flame. The compound A is

A

`H_(2)B_(4)O_(7)`

B

`(C_(2)H_(5))_(2)B_(4)O_(7)`

C

`H_(3)BO_(3)`

D

`(C_(2)H_(5))_(3)BO_(3)`

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