oh sorry!

can you also explain why the correct answer is B? thanks!

24. Considering the following Precedence graphs, which of the following is true? T1 T2 T1 T2 Precedence Graph A1 Precedence Graph B1 A. Precedence graph A1 corresponds to Schedule C. B. Precedence graph B1 corresponds to Schedule C. C. Precedence graph Al corresponds to Schedule A, B and C. D. Precedence graphs A1 and B1 correspond to Schedule A, B and C. E. None of the other answers is correct! Considering the following transactions and schedules, answer the following questions (i.e., questions 22-24). I T. Ta read_item(X); XX+M: write_item(x): T, T2 read_item(x): X X-N: write_item(x): read_item(Y): Y=Y+N: write_item(Y): read_item(x): XX+M; write_item(x): Schedule A read_item(X); XX-N: write_item(X); read_item(Y); YY+N; write_item(Y): Schedule B Ta T, T, T read_item(X): X=X-N: read_item(X); X=X+M; write_item(x); read item(; read_item(x): XX-N; write_item(x): read_item(X); XX+M write_item(X); read_item(Y): Y=Y+N: write_item(Y): Schedule D write_item(x): YOY+N; write item(Y): Schedule C 22. Which of the following statements is correct? A. Schedule C and Schedule D suffer from the temporary update problem (dirty read). B. Schedule C suffers from the lost update problem. c. Schedule B and C suffer from the lost update problem. D. Schedule D suffers from the temporary update problem (dirty read). Correct Answer is B