Answer:
c. place----distribution
Explanation:
Since it is stated in the example that Sidney's customers expressed a wish for the scanners to be sold through retail alongside the online shop, it is clear that Sidney's company faces an issue regarding the distribution channels.
Of course, there is room for improvement, as they have already noted the customer requests for such a distribution channel and they have a steady demand.
To secure (and increase) their existing customer base from the competitor, Sydney's company has to put place and distribution of its products in the marketing focus.