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An experiment is conducted in which red light is diffracted through a single slit

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An experiment is conducted in which red light is diffracted through a single slit.
Then, each of the following alterations to the original experiment is made, one at a time, and the experiment is repeated. After each alteration, the experiment is returned to its original configuration.
A The slit width is halved.
B The distance between the slits and the screen is halved.
C The slit width is doubled.
D A green, rather than red, light source is used.
E The experiment is conducted in a water-filled tank.
F The distance between the slits and the screen is doubled.

A. Which of these alterations decreases the angles at which the diffraction minima appear?