"c or d"? I'd get LRDs so you get more reserve load capacity to reduce risk of a blowout. Make sure they have a more recent date code and not old stock a year or two old or more. Replace the spare too.
If you go for the new GY Endurance tires, they have a higher max inflation compared to their Marathons (no longer made) and all/most of the other "regular" ST tires. If you don't know your rim max psi ratings you can simply run them at a lower psi, like 65 instead of the sidewall 80 psi number, or 50 instead of 65 and get the same load capacity rating that you had before.
You might find a better price online, but if only a few $$ more at a local tire shop, I'd go local.