. . . . . . dogs seldom bite.
Correct answer is: D. Barked
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A piece of cake: This idiom means something is very easy to do. It's like a piece of cake is easy to eat, so completing the task is effortless.
You can't have your cake and eat it too: This idiom means you can't have both of two desirable things at the same time. It's like if you eat your cake, you no longer have it.