How does the double dissolution mechanism resolve deadlocks in parliament?

The double dissolution mechanism serves to resolve deadlocks in parliament by requiring the re-election of all members in the House of Representatives and, because of its nature, all senators as well. This action is typically taken when the Senate repeatedly rejects or fails to pass legislation that the government deems critical, thus resulting in a stalemate or "deadlock."

By calling a double dissolution election, the government can effectively reset the composition of the Senate, which may lead to the election of senators who are more favorable toward the government's agenda or who align better in terms of policy positions. This change in the makeup of parliament can shift the voting dynamics, potentially allowing legislation that was previously blocked to pass during the new term.

This mechanism not only provides a way to break deadlocks but also serves as a political strategy, allowing the government to seek a renewed mandate from the electorate, which can reinforce or alter its parliamentary support. The other choices do not accurately reflect how the double dissolution mechanism functions within the political system.