A new study observed people who watch television and their happiness

OFFICIAL EXPLANATION

Answer: B

STEP 1: Read the question and identify your task.
This is an Assumption question. It is asking you to find a statement upon which the logic of the passage depends.

STEP 2: Read the argument with your task in mind.
The conclusion is that people in industrialized nations with more choices “in all aspects of their life” are not happier than people in less developed nations with fewer choices.

STEP 3: Know what you’re looking for.
The conclusion extrapolates from television to all aspects of people’s lives, so you expect that the correct answer will support the conclusion and most likely the extrapolation.

STEP 4: Read every word of every answer choice.
Answer A focuses only on the television aspect of daily life and not other aspects of their lives. It also somewhat weakens the comparison of nations. Answer B states an inverse relationship—that more channels equals less happiness—also exists among “other categories.” If the same relationship exists among other goods and services regardless of other factors related to where people live in the world, then people in nations with more choices are less happy than people in nations with fewer choices. Thus answer B would seem to give strong support to the argument and to be your answer. For answer C, the argument says nothing about awareness between nations, only that the number of choices determines happiness. For answer D, how each nation judges each other’s choices is irrelevant to their own experience. Like answer A, answer E discusses only the television aspect of daily life. The correct choice is answer B.
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Premise: The study indicated that people who have more channels and thus more choices of what to watch are not necessarily happier than those with fewer choices of what to watch.

Conclusion:
people in highly industrialized nations who have more choices in all aspects of their daily lives are not happier than those in less developed nations with fewer choices in their daily lives.

The premise talks about the relationship between TV channel choices and happiness, whereas, the conclusion talks about choices across all aspects of life. We need something that establishes a relationship between choices in TV channels and choices across all aspects of life through the lenses of an outsider.

(A) it is equally likely that people in less developed nations have as many television channels as people in highly industrialized nations..................It's not an assumption

(B) the inverse relationship between happiness and the number of television channels is the same among other categories of goods and services regardless of other factors related to where people live in the world.......................This matches with our pre-thinking reasoning. Keep it.

(C) people in less developed nations are unfamiliar with the number and quality of choices available to those in highly industrialized nations.............We are not concerned about number & quality of choices

(D) people in highly industrialized nations have visited less developed nations and determined that their choices are of lesser quality and less likely to make them happier..................................This is out of scope.

(E) the relationship between the number of television channels and happiness is directly related to the stage of a society’s industrialization and thus an industrialized nation will feel the effects of such disparities more significantly..............................This is not an assumption

IMO OA should be B