The answer is 2-to-the-power-of-n, since for every input, the number of different combinations doubles. From your list I think answer A is meant to indicate 2ⁿ.
<u>
Allows you to see two parts of the same worksheet side by side</u>
<u>Option: B</u>
<u>Explanation:</u>
The View Side by Side command helps to see the two documents side by side in Word. When using this feature, both the documents open at the same time in different windows side by side.
To view this, click the View tab in Word and then click the View side by side button. Now the document opens in two windows with side by side views. This is used to compare the documents. In case, if we want to disable this view, click the 'View Side by Side' button again so that it comes to the normal view.