The correct answer is d: with a two-thirds majority in both houses.
To override a presidential veto, Congress must pass the bill again with a two-thirds majority vote in both the House of Representatives and the Senate. This process is laid out in the U.S. Constitution in Article 1, Section 7.
Here is how you can arrive at the answer:
1. Understand the options:
a. With a simple majority in both houses: This means that the bill can be passed by a regular majority vote, which is not correct.
b. By using the filibuster: The filibuster is a tactic used in the Senate to delay or prevent a vote on a bill, it is not related to the override of a presidential veto.
c. With a two-thirds in conference committees: Conference committees are used to reconcile differences between House and Senate versions of a bill, but this is not the correct method for overriding a presidential veto.
d. With a two-thirds majority in both houses: This is the correct method for Congress to override the president's veto.
2. Compare the options:
Among the given options, only option d mentions a two-thirds majority in both houses, which aligns with the correct process for overriding a presidential veto.
Therefore, the correct answer is d: with a two-thirds majority in both houses.