Bioplus Inc. has introduced a new anti$-$aging cream in the market with a price that is higher than those of similar products from its competitors. At which position should Bioplus Inc. include the price in its sales message?

a$.$ In the closing sentence of the message as the reason for taking action

b$.$ At the beginning of the message as an attention$-$getter

c$.$ Throughout the message as a central selling point

d$.$ Late in the message after discussing the product's benefits