Why do search ad extensions matter? A. The cost-per-click on ad extensions is lower than on a search ad headline B. They guarantee higher engagement for advertisersC. They increase ad quality and drive lower conversion costsD. They increase engagement and influence ad quality

Option A, The cost-per-click on ad extensions is lower than on a search ad headline

Explanation:

Ad extensions provide better user interactions options and they allow people to take direct action from the search results.

More clicks can easily be obtained through ad extension and make an add cost effective (by reducing the cost incurred per click) and appealing. With reduced cost per click, as extension also guarantee higher engagement for advertisers and hence increase influence and quality

Hence, option A is correct