Your only real option is a RW LR with that kind of commute.
The range difference between the LR RWD and the LR AWD is pretty small. As the former is no longer available new, and Tesla has tweaked its efficiency numbers since the last time it was offered, it's unclear how big the difference is. As I recall, the last time the LR RWD was sold, it was rated at 325 miles, vs. 310 miles for the LR AWD. Even assuming a charge to 90% and leaving a 10% gap at the bottom, that 310 miles translates to 248 miles, which is 42% over the 175-mile commute distance. That's a comfortable enough gap for all but the very coldest of days. (Charging to 100% on a very cold day when you expect to drive 175 miles is reasonable, so long as you don't do it too often.) The extra ~15 miles (more like ~10 miles under those conditions) of the LR RWD
could be useful on rare occasion, but if the commute really is that close to the line on a regular basis, I'd say that any Model 3 isn't adequate, at least not without charging available at work or
maybe a Supercharger along the way.
Get RWD if you can and don't mind the loss of performance. You'll get a little more range, for a little less money. I understand they are potentially available as an off-menu item.
The last I heard, the LR RWD was no longer available, at least new from Tesla. It was moved off-menu in the spring of 2019 (I don't recall exactly when), then quietly discontinued entirely. I probably got one of the last ones produced, in late March of 2019.
That said, Tesla has discontinued it twice and resurrected it once. They could bring it back again, but I wouldn't assume it will happen. If you really want one and can afford to wait, then that's an option. Otherwise, it's necessary to settle on an SR+ or an LR RWD; or buy an LR RWD on the used market. A used one is likely to have at least a little battery degradation baked in already, and so might not give better range initially than a new LR AWD, although a used LR RWD would probably asymptote out to a better value than a new LR AWD after a few years.