Sporks are pretty useless. If we're talking about dinner knives not real knives, I'd definitely have to say fork. A fork can do everything except eat soup, but you can drink soup, so that doesn't matter.

I eat cake with-- a fork!

I eat applesauce with-- a fork!

I like spoons for soup, but as I said they're a luxury. And depending on what sort of steak you're eating you might need a bowie knife-- but that falls outside of the current choices.

DA