Baby A because M&M's melt in your mouth, not in your hands and babies have a famously great death grip on things so I most likely would have to wrestle baby A for the candy.
And then I would run.
And laugh
and laugh
and laugh
and laugh.
And then I would run.
And laugh
and laugh
and laugh
and laugh.
Disclaimer: I am only responsible for what I say, not what you choose to understand.