If action is always equal to reaction, why does a horse-cart system move?

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Questions Match

1. If action is always equal to reaction, why does a horse-cart system move?

1. Action is greater than reaction2. Frictional force on horse is greater than on cart3. Horse exerts force on ground, which reacts4. Cart has less mass

2. If action = -reaction, why do objects accelerate?

1. Because action force is applied first2. Because net external force acts on the object3. Because third law doesn't apply always4. Because mass varies

If action is always equal to reaction, why does a horse-cart system move?