700c and 29’er wheels are the same size but the rims widths vary a lot. It’s the inside rim measurement that counts – the bit the tyre edges sit in, not the outside overall rim width. So you can put mountain bike 29’er tyres on if your wheel rims are wide enough (if not they may roll off when cornering hard etc).
If your rims are only 15mm wide (like most road bike and many commuter rims) I’d opt for safety and get a cyclocross tyre. If your rims are wider, say 19mm you’ll be fine with the racing ralphs or anything up to around 2.3″ so long as they fit in your frame of course. If you have 17mm wide rims then a thin mountain bike tyre will fit or a cyclocross one.
Something like a continental cylocross or a schwalbe cx pro would be a good CX choice with a decent amount of grip.