It means stick,attach or fasten something
Answer:
a. The second sentence provides background for the first
Explanation:
According to the first sentence, research has proven that colorful and vivid advertisements helps to attract more people.
Additionally, the second statement says that marketers use various research studies to develop their advertisement.
The relationship between the two sentences is that the second sentence provides background for the first by explaining how the market research has helped.
A show of understanding or non-understanding through facial expressions
It is answer A because the speaker cannot understand what he did wrong.
