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Could someone kindly clarify why C is incorrect ?
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Could someone kindly clarify why C is incorrect ?

The tourists want to make sure that they have done most of them, irrespective of how committed they are to the locals. Therefore option C is incorrect.
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vachas
Could someone kindly clarify why C is incorrect ?

This is a good chance to really practice understanding some fundamentals of GMAT CR. There's a lot more structure to these questions than might first meet the eye.

It will first help to really specify what the GMAT means by 'assumption.' An assumption on the GMAT is some idea that is:

a). not explicitly stated
b). necessary for the argument to stand.

Arguments can have (and usually do) *many* of these necessary assumptions.

So let's take a look at the argument:

Quote:
Xani and Yata are the only two languages spoken in the country of Zorba, with Xani
spoken by the majority of Zorba’s residents. Thus, by learning Xani prior to visiting
Zorba, tourists can feel confident that they have done the most that they can to assist in communicating with Zorba’s locals

After you've read an argument, take a good moment to really specify what the CONCLUSION of the argument is: the (explicitly stated) idea that the argument really is trying to convince you of.

Here that is 'by learning Xani, tourists can feel confident that they have done the most they can to assist communicating with locals.'

It's important to focus like a laser on that conclusion, because it gives you the SCOPE of the argument (that is, it tells you what is RELEVANT to the argument, or not). Here, we are curious about only: "is learning Xani *really* the most tourists can do to assist in communication with the locals? Or is there MORE tourists could do to assist in communicating with the locals?"

That's the key question at hand.

Now, consider some questions that are also related to the situation, but are NOT relevant:
--Should tourists want to assist in communication with the locals?
--Does learning the native language of other tourists destinations assist in communicating with the locals there?
--Will tourists be willing to put in the time it takes to learn a language?
--Is Zorba a popular tourist destination?

We just want to know whether learning Xani is truly the MOST tourists could do to assist in communicating with the locals.

So why is C wrong?

Quote:
(C) Most tourists are committed to effectively communicating with the residents of
the countries that they visit.

This is one of those irrelevant questions. Whether or not tourists WANT to effectively communicate does not change which actions would be the most effective in doing so. (I might not WANT to get in good shape, but frequent exercise is most effective way of getting in good shape).

Let's look at right answer D:

Quote:
(D) Learning both Xani and Yata would not allow tourists to better communicate with
the residents of Zorba than would only learning Xani.

Well yes that seems necessary to the argument! To see why let's employ the NEGATION TEST. The negation test works like this: since the assumption is NECESSARY for the argument to hold, NEGATING an assumption would destroy an argument. Only one of the right answers is a necessary assumption, so negating the right answer would ruin the argument.

negating D:

"Learning both Xani and Yata WOULD allow tourists to better communicate with the residents of Zorba than would only learning Xani."

Well if that's true, then learning Xani alone is not the MOST a tourist could do to assist in communicating with the locals, since laerning Yata would, in fact, help them even more.
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vachas
Could someone kindly clarify why C is incorrect ?

Think of it this way:

Conclusion: If you want A, do B.

Now is your assumption going to be something related to whether people want A or not? No. It will be related to whether B is the way to get A.
Similarly, if you want to strengthen it, you have to support why doing B is a good idea to get A. It is not going to be about whether you want A or not.

Here the conclusion:

by learning Xani prior to visiting Zorba, tourists can feel confident that they have done the most that they can to assist in communicating with Zorba’s locals.

is similar in structure to

If tourists learn Xani prior to visiting Zorba, they can feel confident that they have done the most that they can to assist in communicating with Zorba’s locals.

Hence our assumption cannot be that most tourists are committed to effectively communicating with the residents of the countries that they visit. We are not assuming that. Our assumption is that learning both languages will not be even better (and hence, tourists can feel confident that they have done the most they can).


Check this video that discusses how to handle conditional statements: https://youtu.be/BW8Ijrhjjq8
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