4 if you can manage it – even though its a 2wd vehicle its not only the driven wheels that matter. In snow you use 2 wheels to get moving but you use all four of them to stop and steer. Your manual will probably recommend a various winter and summer tyre types but what it won’t recommend is mixing them
Its best to have a matching level of grip all round – not in the chugging through deep snow scenario but in general driving – front wheel drive cars suffer if the they’ve got less grip at the back when its wet. When you’re cornering , in a situation where you might understeer or drift a bit the front grips but the rear slips so you can spin quite easily. In a transit where you’ve got a lot of weight over/ forward of the front wheels then this would be exacerbated when you’re driving empty.
Quite often when people are replacing tyres they’ll tend to want to put the newest ones up front on the basis that those are the driven wheels but its actually wise to have more tread at the back.