The concept of an ad is its: A. underlying creative idea.

B. overall look and layout.

C. use of subheads.

D. placement of visuals.

I think its B
In an ad we see the overall product, usually very short and quick

5 Reasons for the US Entry into World War I

In response to Britain’s blockade, Germany turned to unrestricted submarine warfare to keep goods from reaching Britain. After the Sinking of the Lusitania, Germany promised to stop unrestricted submarine warfare but within less than one year, they torpedoed another passenger ship - the cross-English Channel ferry Sussex. Again, the Germans promised not to attack passenger ships without warning (the Sussex Pledge). But that pledge was short lived as well.

the answer is true