Which of the following will produce a buffer solution when mixed in equal volumes?

Options

A. 0.1 mol `dm^-3 NH^4OH` and 0.1 mol `dm^-3 HCI`
B. 0.05 mol `dm^-3 NH^4OH` and 0.1 mol `dm^-3 HCI`
C. 0.1 mol `dm^-3 NH_4OH` and 0.05 mol `dm^-3 HCI`
D. 0.1 mol `dm^-3 CH_3COONa` and 0.1 mol `dm^-3 NaOH`