Which of the following reactions is balanced?
A. Sn2+ + Fe 3+ -->Sn4+ + Fe2+
B. 2Sn2+ + Fe3+ --> 2Sn4+ + Fe2+
C. Sn2+ + 2Fe3+ -->Sn4+ + 2Fe2+
D. Sn2+ + 2Fe3+-->Sn4+ +Fe2+​