Answer: Option ' D' is correct.
Since we are trying to sell a new product to a store owner.
We will apply the scheme of a free trial option to use the product for six months. and we will also show them a chart showing how sales will go up if they use this product.
And all those quotes from other store owners on success of this product.
They all are the method of presentation which is the most effective.
Hence, Option ' D' is correct.