Here is a series of three steps:

Step 1: A = 10
Step 2: B = 20
Step 3: A = B

A and B are variables, that is they can stand for any value.
The "=" sign stands for assignment. It means "assign the value on the right to the variable on the left".
After all three steps above have been completed, what are the values of A and B? *
A = 30, B = 0
A = 30, B = 20
A = 20, B = 20
A = 20, B = 0
A = 10, B = 10
A = 10, B = 20
A = 20, B = 10
A = 0, B = 10