Which situation would not happen in a parliamentary form of government?
the executive consults with the legislature about whether to declare war on a neighboring nation.
the government dissolves when the ruling party cannot affect change on a major issue.
the legislature chooses the executive.
the executive selects a member of her cabinet of which the legislature does not approve.

I think that the situation that would not happen in a parliamentary form of government is Choice B - the government dissolves when the ruling party cannot affect change on a major issue.

There was an event in the U.S.A in 2013 where the government shutdown due to their inability of the President and Congress to reach a compromise or solution to solve the debt crisis at that time.  

In a Parliamentary government, the executive and the parliamentary are united in making decisions and passing laws with its majority. This leads to a very efficient form of government.