Step 1: Author's focus.
John Galsworthy critiques social injustices and class issues.
Step 2: Eliminate others.
"Political/moral/public" don't capture the primary category.
Step 3: Conclusion.
(D) social.
“One of these days you’re going to talk yourself into a load of trouble,” her father said aggressively. What do you learn about Sophie’s father from these lines? (Going Places)