#17 - To measure a small boat hull accurately, it is necessary to level the hull

[Administrator]

Complete Question Explanation

Must Be True. The correct answer choice is (D).

Answer choice (A):

Answer choice (B):

Answer choice (C):

Answer choice (D): This is the correct answer choice.

Answer choice (E):

This explanation is still in progress. Please post any questions below!

[zoezoe6021]

According to the stimulus,

Accurately measure→Level the hull→"line level"

(D) is correct because it says Accurately measure→"line level"

But I don't understand why (B) is incorrect.

I see "provided that" as "only if" , so I think (B) states that Accurately measure→Level the hull

[Jeff Wren]

Hi Zoe,

Your diagram of the stimulus looks good, as does your description of Answer D.

Unfortunately, your interpretation of Answer B is backwards.

Here, "provided that" would be equivalent to "if" rather than "only if" and would introduce the sufficient condition.

What Answer B is basically saying is:

If (i.e. provided that, given that, etc.) they have leveled the hull, then they accurately determined the hull’s dimensions.

This is a Mistaken Reversal of what is stated in the stimulus.