when someone talking about deadlock free that means it is conservative 2Pl because in normal 2PL deadlock can occur.
The property of conservative 2pl to be deadlock free but starvation can posible.
increasing order of their addresses means locks are acquired and no locks are released.
In Conservative 2PL protocol, a transaction has to lock all the items it access before the transaction begins execution. To avoid deadlocks, we can use Conservative 2PL.
so it is deadlock free but drawback is starvation is possible .
Hence in this 4 options only option A is true.