Fuse C is the alarm and a few other things, fuse 9 is the radio. The total draw borders on excessive, the radio circuit being most of it. As Joe pointed out this shouldn't take out a battery unless left sitting a long time. We usually get upset if the total current gets to 100ma, Although this amount is more common on later cars with many control units with memory.
Bosch Master, ASE Master, L1
33 years MB technician