Preserve image dimensions

Hi I am about to do my ACE exam for ID

So i have been studying away - and am not happy with the 'preseve image dimension' option

Here is a practice question from the adobe site (with supplied answer)

4.1 Given a scenario, determine the best settings for choosing and placing an image

You want to replace an image from a selected frame. The new image is larger than the original
image. You want the new image to be imported at the same scaling percentage as the original.
What should you do?

A. hold down Shift as you click the Relink button in the Links panel
B. hold down Option/Alt as you click the Update button in the Links panel
C. before replacing the image, deselect Preserve Image Dimensions When Relinking in the
File Handling pane of the Preferences dialog box
D. before replacing the image, select Preserve Image Dimensions When Relinking in the File
Handling pane of the Preferences dialog box

Correct answer: C

BUT it says this in the help file

Choose how relinked graphics are scaled

When you relink to replace one graphic with a different source file, you can keep the image dimensions of the file that’s being replaced, or you can display the incoming file in its actual dimensions.

1. Choose Edit > Preferences > File Handling (Windows) or InDesign > Preferences > File Handling (Mac OS).

2. Choose Preserve Image Dimensions When Relinking if you want images to appear at the same size as the images they’re replacing. Deselect this option to have relinked images appear at their actual size

Is this a contradiction or am i being thick

Thanks