When cleaning aluminum and magnesium engine parts, it is inadvisable to soak them in solutions containing soap because
A: some of the soap will become impregnated in the surface of the material and subsequently cause engine oil contamination and foaming.
B: the soap can chemically alter the metals causing them to become more susceptible to corrosion.
C: the parts can be destroyed by dissimilar metal electrolytic action if they are placed together in the solution for more than a few minutes.