Assume Two Threads Share a BankAccount Object with Balance of Zero

Assume two threads share a BankAccount object with balance of zero (0) , and that the BankAccount class provides deposit and withdraw methods as shown below. Thread one deposits $10 ten times and, concurrently, thread two withdraws $10 ten times. If the balance after all thread calls is 0, which statement is definitely true?
Public void deposit(int dollars)
{
Int newBalance = balance + dollars;
System.out.println("depositing") ;
Balance = newBalance;
}
Public void withdraw(int dollars)
{
Int newBalance = balance - dollars;
System.out.println("withdrawing") ;
Balance = newBalance;
}

A) The calls were interleaved: thread one, thread two, thread one, thread two, …
B) The first call was to the deposit method.
C) The last call was to the withdraw method.
D) Each individual call to the deposit and withdraw methods ran to completion.