Final answer:
John Shakespeare was granted a second coat of arms application due to his increased social status, bolstered by his own civic achievements and his son William Shakespeare's success in the world of drama and business.
Step-by-step explanation:
The reason ultimately given for John Shakespeare's second coat of arms application being granted is due to his increased social status. John Shakespeare, William Shakespeare's father, was a leatherworker and a prosperous businessman who made his way up to become an alderman and then the town bailiff of Stratford, effectively serving as its mayor.
His ascent in the local community, along with William Shakespeare's financial success in London as part of the Lord Chamberlain's Men (later the King's Men), his writing, acting, and significant real estate investments in Stratford, showcased the family's elevated position in society which would have been acknowledged through the granting of such a coat of arms.
A second coat of arms application by John Shakespeare, the father of William Shakespeare, was ultimately granted because of his successful business ventures.
Therefore answer is d) Successful business ventures.