Answer: Option C
Explanation: In simple words, penetration pricing refers to pricing strategy in which an organisation initially sets the prices of its product as to create market share and to build a customer base.
After achieving a certain amount of word of mouth and awareness in the eyes of customers, organisation increases its price for a certain marginal profit.
In the given case, Bell star is doing the same functions as explained above. Hence we can conclude that company is using market penetration.