A.
The constituents of the mixture are:
UN2030 Hydrazine, aqueous solution Class 8 (6.1) PG II,
UN1249 Methyl propyl ketone Class 3 PG II, and
UN1090 Acetone Class 3 PG II.
According to Table 3.10.A, with a mixture of Class 3 PG II and Class 8 (liquid) PG II, the primary hazard is Class 3 with a sub hazard of Class 8, and the PG is PG II. Consequently, your choice of “UN3286 Flammable liquid, toxic,, corrosive, n.o.s.★ PG II” is correct. Since the material is a waste, you need to put the word “Waste” at the front of the PSN. In place of the ★, you will indicate in brackets (Hydrazine, ketone & Acetone mixture).