How his grandparents influenced his storytelling skills is the information should be added to make this a complete summary.
Complete sentence provide the full information about anything, it also gives knowledge and understanding about the concept. Complete sentence example is if there is a sign board, then there is also a route for this side.
The option are missing in the question of which are given below
A. why he spent his childhood with his grandparents
B. how his grandparents influenced his storytelling skills
C. how his time with his grandparents changed his thoughts
D. why his grandparents told him stories when he was young
Thus, option B is correct.
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