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(A) Shamans only chant their chants on moonlit nights.
- This assumption is not necessary for Damian's conclusion. Damian's conclusion is about the effectiveness of the chant during different moon phases, not when shamans choose to chant.

(B) It only rains after the recitation of the Chant of Rain.
- This assumption is not necessary for Damian's conclusion. Damian's conclusion is based on the observation that rain follows the recitation of the chant during a full moon, but it doesn't require that rain only happens after the chant.

(C) The Chant of Rain is only effective when recited under a full moon.
- This assumption is crucial for Damian's conclusion. His conclusion is that summoning rain using the chant is only possible during a full moon, and this assumption directly supports that conclusion.


(D) The shamans' ability to control weather has not been scientifically proven yet.
- This assumption is not necessary for Damian's conclusion. His conclusion is based on the observed connection between the chant and rainfall, regardless of whether the shamans' abilities have been scientifically proven.

(E) The chant is ineffective unless a group of experienced shamans recites it.
- This assumption is not necessary for Damian's conclusion. His conclusion is about the timing of the chant (full moon) rather than who is reciting it or their experience level.

So, option (C) is the assumption that Damian's conclusion relies on. Without this assumption, his conclusion that the chant won't work in the three weeks before the full moon wouldn't hold.
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OFFICIAL EXPLANATION



Having studied the mystic art of shamanism for seven years, Damian noticed that when the Chant of Rain was recited by a group of shamans during the night of a full moon, the place mentioned in the chant would get rainfall within a week. Damian thus concluded that it would be impossible to summon rain using the chant during the three weeks before the full moon.

Damian's conclusion relies on which of the following assumptions?



(A) Shamans only chant their chants on moonlit nights.

Incorrect.

To solve this Assumption question, first break down the argument. The second sentence includes a conclusion conjunction (thus) and a conclusion word (concluded) so it's the conclusion, and the first must be a premise.

Damian thinks the chant won't bring rain in the weeks before the full moon because he saw it working under a full moon. Now ask yourself: what must Damian assume for this argument to stand?

Moonlit nights is a general term which could include nearly all the nights of the month. Therefore, it does not help to explain why Damian thinks the chant would not work three weeks before the full moon.



(B) It only rains after the recitation of the Chant of Rain.

Incorrect.

This answer choice does not explain Damian's conclusion. Damian concludes rain cannot be summoned three weeks before a full moon by using the chant, and not that it never rains during those weeks.



(C) The Chant of Rain is only effective when recited under a full moon.

Damian's conclusion is based on the assumption that since he only witnessed the chant being recited under a full moon, that's the only time when the chant is effective. This explains why he thought rain cannot be summoned at any time other than the week that followed the full moon (i.e., not during the other three weeks).

In this case, Damian took a specific case (chant recited under full moon) and made a generalization (chant does not work without full moon).



(D) The shamans' ability to control weather has not been scientifically proven yet.

Incorrect.

To solve this Assumption question, first break down the argument. The second sentence includes a conclusion conjunction (thus) and a conclusion word (concluded) so it's the conclusion, and the first must be a premise.

Damian thinks the chant won't bring rain in the weeks before the full moon because he saw it working under a full moon. Now ask yourself: what must Damian assume for this argument to stand?

If Damian didn't believe in the shaman's power - why would he limit his conclusion to three weeks of the month?



(E) The chant is ineffective unless a group of experienced shamans recites it.

Incorrect.

The people performing the chant are not a part of Damian's conclusion; therefore, this answer choice does not explain why he thought the time of the reciting, rather then the people who perform it, determines its effectiveness.
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