What Would Happen to Normal-Weight Mice If I Colonized Their

What would happen to normal-weight mice if I colonized their guts with Firmicutes bacteria from obese mice?

A) The mice would gain weight despite a lack of increased eating.
B) The mice would overeat and then gain weight.
C) The mice would become sedentary and then gain weight.
D) The mice would lose weight despite a lack of decreased eating.