I know that this might be wrong but is it light?
The
answer is (A): with contextual tabs for major groupings of editing features and
ribbons with specific groupings to organize commands.
Contextual
tab or tabs are hidden menu that appears when objects like images or texts are
selected in programs like MS Word 2013. They typically contain one or more
commands applicable to a selected text or object only. They are there in the
Ribbon when you need them and disappear when you do not need them anymore. They
are basically used for major groupings of editing features.
A
ribbon on the other hand help users understand how commands are used directly
and efficiently. It organizes a program’s features into a series of tabs.
Run,lazy,turtles,slow,wandering, jump,45,weird,pigs, cows, cousins, pale,rude,candles
There are many answers for this but this is what first came to my mind
Hope this helps
C. The viewing area of a web browser.
The viewport is the user's visible area of a web page.