Following are (or items/powers have)orb effects:
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Manta Style
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Feast (Naix's Lifesteal)
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Diffusal Blade
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Frost Arrows
C,D
Correct answer
Explanation
In DotA's orb effect system, Diffusal Blade's purge and Frost Arrow's slow were classic orb effects that did not stack with other orbs. Manta Style did not have an orb effect - it was a unique item based on illusions. Feast (Naix's lifesteal) was a unique attack modifier, not an orb effect in the traditional sense, meaning it could stack with certain other effects. Orb effects were a complex but important game mechanic.