Answer:
D. The executive can veto a bill from the legislative branch.
Step-by-step explanation:
The legislative branch's main duty is to propose a new Bill that could be passed into a law. But, before it's finalized into a law, the Executive branch could intervene the process and impose a Veto to that proposal.
When the Bill is vetoed, the whole process is paused. In order to override this veto, the only thing that the legislative branch can do is to gather the vote support of 2/3 of its total members to override this veto. But, this might now always be successful. Some people in the legislative body are probably give their support to president in the executive branch.