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Ludere means to trick. Collusion is secret, illusion is a trick, elude is to avoid escape. These are not options. A prelude is an introduction - almost like a taste to trick you into reading, hearing, seeing more. An ablution is a washing - not connected to a trick at all. Ablution is your answer.
General Zaroff and Sanger Rainsford are in direct, man versus man strife when they chase each other. Zaroff and Ivan are additionally in direct clash with every one of the mariners who have "unintentionally" wrecked on the island. Ivan and Rainsford likewise have an immediate clash.
Proper nouns are names of people, places, rivers, etc. So, having that in mind, the correct answers are A) Fred, because that is the name of a human, and D) Colorado River, because that is the name of a river.