Which of the following reactions are disproportionation reactions?
$(A)$ $2 Cu^{+} \rightarrow Cu^{2+} + Cu$
$(B)$ $3 MnO_4^{2-} + 4 H^{+} \rightarrow 2 MnO_4^{-} + MnO_2 + 2 H_2 O$
$(C)$ $2 KMnO_4 \rightarrow K_2 MnO_4 + MnO_2 + O_2$
$(D)$ $2 MnO_4^{-} + 3 Mn^{2+} + 2 H_2 O \rightarrow 5 MnO_2 + 4 H^{+}$
Choose the correct answer from the options given below:

• A
  $(A)$,$(B)$
• B
  $(B)$,$(C)$,$(D)$
• C
  $(A)$,$(B)$,$(C)$
• D
  $(A)$,$(D)$