For the following pairs of alloys that are coupled in seawater, predict the possibility of corrosion; if

Question:

For the following pairs of alloys that are coupled in seawater, predict the possibility of corrosion; if corrosion is probable, note which metal/alloy will corrode.
(a) Aluminum and magnesium
(b) Zinc and a low-carbon steel
(c) Brass (60Cu–40Zn) and Monel (70Ni–30Cu)
(d) Titanium and 304 stainless steel
(e) Cast iron and 316 stainless steel