When you ask your partner to reach a decision you are asking the brain to work very hard. The brain hates to make a decision and the decision making part of the brain will hate you for that.
This part of the brain known as the Reptilian Brain or System 1 prefers you to give the choice among …. 1 element, not more.
See in this video how long it takes to a 3 year old child (his brain runs exactly like the decision maker in your adult brain) to select two candies in a box full of many.