As far as my logic goes it shud be option d this is because option a cannot be the answer as it is not Pareto Efficient and hence cannot be competitive either, its not Pareto Efficient because the by moving to (1,0) and (1,1) agent A will be better off while B will be at the same utility level as compared to the original endowment bundle. Option b cannot be the answer as Agent B is getting worse off than the initial utility level. Similarly option c cannot be a competitive equilibrium because Agent A is getting worse off as compared to the initial bundle. However option d is pareto efficient because no agent can be made better off without making the other worse off. And so it is the only option left to be competitive.
"I don't ride side-saddle. I'm as straight as a submarine"