Page 903 - AP Computer Science A, 7th edition
P. 903
10. (C) Here are the memory slots:
Statements II and III are true because the contents of s1 and s2 are the same, and the contents of s3 and s2 are the same. Statement I is false because s1 and s2 are not the same reference. Note that the expression s1 == s3 would be true since s1 and s3 are the same reference.