Evaluations for input

What are the values of X and Y if X=20 and Y=30 initially and these transactions are executed serially, T1 before T2? (<image 1>)?

(A) X=20, Y=30

(B) X=50, Y=80

(C) X=70, Y=50

(D) None of the other answers

Answer with the option's letter from the given choices directly. No punctuation.