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y = 4^{Log_e\ x}\\\\take\ logarithms\ to\ the\ base\ 4\\\\Log_4 y=Log_e x}\\\\x=e^{Log_4 y}
There does not seem to be this option among the given options.

Log_4 y=log_e x\\log_4 y=Log_4 x\ *\ Log_e 4\\\\ Log_4 x=\frac{1}{log_e 4}log_4 y\\\\=(log_4 e)*log_4\ y\\\\=Log_4\ (y^{log_4\ e})\\\\x=y^{log_4\ e}

this is the option  (b)

2 5 2
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