Answer A
A.
a=t;t is assigned to a, and the value of t is stored in a
t =b, b is assigned to t, and the value in b stored in t
b=a, a is assigned to b, and the value stored in b is the value of a at this time, that is, t
< p>So the t stored in a, the b stored in t, and the t stored in b are not exchanged between a and b, but a and t.Others can be analyzed in the same way, That's right