Seeing Orange

Connect A, B, C and D.

The Economist describes A as follows: “involves commodity exports driving up the value of the currency, making other parts of the economy less competitive, leading to a current-account deficit and even greater dependence on commodities”. What is A?

B is a door divided horizontally in a way that the bottom half may remain shut while the top half opens. The initial purpose of this door was to keep animals out of farmhouses, or keep children inside, while allowing light and air to filter through the open top. What is B?

In 1650 Franciscus Sylvius, created C, a gin, in an attempt to create a diuretic medicine. This was then used in the Thirty Years’ War by English troops and was an instant success for its believed warming properties on the body in cold weather and its calming effects before battle.
What phrase was thus originated or what is C?

D is a practical joke where someone lying in bed with another person pulls the covers over the person’s head while flatulating, thereby creating an unpleasant situation in an enclosed space. What is D?

Clue:Gold leader