JavaScript differences?

test.js

// Version A: Works
WO.workouts = {
  init: function() {
    WO.workouts.index.init();
  }
};

WO.workouts.index = {
  init: function() {
    $('.calendar td').click(function(){
      alert("TO-DO: You've clicked a calendar cell!");
    });
  }
};

// Version B: Doesn't work
WO.workouts.index = {
  init: function() {
    $('.calendar td').click(function(){
      alert("TO-DO: You've clicked a calendar cell!");
    });
  }
};

WO.workouts = {
  init: function() {
    WO.workouts.index.init();
  }
};