Choose the pair of words that best fills the blanks. E-business firms are gaining popularity day by day…

The pair that fits is product varieties, price. Online sellers attract buyers by offering a far wider range of products than a physical store can stock, and at lower prices because they save on shop rent and intermediaries. Lower offerings or lower quality would drive customers away, not attract them, and higher profits for the firm are no reason for buyers to prefer it; lower tax is not a general feature of selling online.