Which CSS segment should you add to the style sheet?

You are developing a Windows Store app. The app includes the following HTML markup:

You are creating a Flexible Box layout for the application. The layout must be configured as shown in the
following display.

The Flexible Box layout must conform to the following requirements:
The Child2 DIV element must appear on the right side of the layout. The Child1 DIV element must appear
immediately to the left of Child2. You need to add CSS to ensure that the requirements are met. Which CSS
segment should you add to the style sheet?

A.
Option A

B.
Option B

C.
Option C

D.
Option D