Alright, let's break down the conversation and argument here:
Premila emphasizes the importance of having a written explanation for their quality-assurance process, even if everyone has internalized it.
Graciela agrees but asserts that they don’t need to document it because they have a procedures manual from the Internal Programs department that they can use. Graciela makes a claim that all the steps in their process are identical to the process used by Internal Programs.
Let's find the underlying assumption in Graciela's argument.
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A. at least some people who currently work with Graciela's quality-assurance process have not thoroughly internalized all aspects of the process
This doesn't connect with Graciela's main point, which is about using the procedures manual.
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B. all steps in the quality-assurance process used by the Internal Programs department are explained in the procedures manual used by that department
This seems to hit the mark. For Graciela's claim to hold, the procedures manual must document all the steps. If any steps are missing from the manual, then they can't rely on it entirely.
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C. at least some of the steps described in the procedures manual used by the Internal Programs department are likely to be modified in the near future
The argument doesn't concern future modifications, so this is not the core assumption.
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D. everyone who has thoroughly internalized all aspects of Graciela's quality-assurance process has done so as a result of reading the Internal Programs department's procedures manual
This is not necessarily assumed. Graciela's main point is about the content of the manual and not how people learned the process.
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E. if everyone who works with the Internal Programs department's quality-assurance process had thoroughly internalized the process, Internal Programs would not have developed a procedures manual
This is a generalization that doesn't directly address Graciela's point about the equivalency of the two processes and the existence of the manual.
From our analysis, the most fitting assumption for Graciela's argument is:
B. all steps in the quality-assurance process used by the Internal Programs department are explained in the procedures manual used by that department.
With this assumption, Graciela can confidently rely on the procedures manual as a complete guide for their quality-assurance process. I hope that clears things up!