provide

Lend or give would be best. Provide is ok. Contrary to the apparent popular opinion "render" actually would work here. It just sounds unusual. I have heard the phrase "render support" or "render aid" in reference to sending someone somewhere to help out but it isn't typically used by anyone too often.

I’d also favour “lend” as my first choice. Render is unlikely to be correct.

There are three possible answers. "Lend" is the best option, I think. "Lend support" is a very natural collocation. "Give" or "provide" would also be OK. "Render"is wrong.

I think "provide support" is more common than "give support," but which term you use could depend on the context, as Ann noted. Specifically, if this is a legal context, then there could be a more formal phrase, such as "render" (though I doubt it).