Answer: Option B
Explanation: In simple words, relationship marketing refers to the marketing strategy under which an organisation interacts with their customers through open communication and tries to build customer loyalty by proving them information and services that are best suited to their needs.
Organisations using such strategies focus on building positive relationship with the customers to retain them for a long time period and build a strong customer base for continuing high revenues and high market share.
In the given case also the company is rewarding their active customers by special services, thus, they are doing relationship marketing.