Which of the following will make a basic buffer solution.

• A

  100 mL of $0.1 \mathrm{M} \mathrm{HCl}+.100 \mathrm{~mL}$ of 0.1 M NaOH
• B

  100 mL of $0.1 \mathrm{M} \mathrm{HCl}+100 \mathrm{~mL}$ of 0.1 M NaOH
• C

  50 mL of $0.1 \mathrm{M} \mathrm{KOH}+25 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{CH}_3 \mathrm{COOH}$
• Correct answer
  D

  100 mL of $0.1 \mathrm{M} \mathrm{HCl}+200 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{NH}_4 \mathrm{OH}$

Hence, the correct answer is option: 'D'.