Directions: Read the three sentences provided below carefully. Determine whether each sentence is grammatically/contextually correct or incorrect. Select the option that correctly identifies which sentence(s) is/are correct or incorrect.

A. In today's age, there's stubble peer pressure among seniors as they witness their peers sharing ambitions to join new assignments or pursue advanced degrees in retirement, redefining traditional retirement concepts.
B. Modern retirement theory highlights the evolving concept of seniority, where engagement in purposeful activities through social media can stave on age-related health issues, challenging conventional notions of ageing.
C. Seniors now explore diverse pursuits, from daring social media challenges to sharing wisdom, recipes, and traditional remedies online, ushering in an era where retirement means staying active, not a life of idleness.