Apart from the fact that the stacked sequence is deprecated in that it's pretty well hidden in the menus; Q40 answer should be C, they're equal for all intents and purposes except a couple of fringe cases.
Q16 also seems pretty strange and badly formatted, it you answer D, does that mean all of the above is false? A is correct compared to not using SubVIs, it's also easier to debug and so on, so i'd say D.
Check the current CLAD preparation material, it'll be better.
http://www.ni.com/gate/gb/GB_EKITCLADEXMPRP/US
/Y