I'd also say 2b.
Your hair actually looks like mine a little. Mine is not as long, nor red, nor as pretty. But the bulk of my hair is pretty similar to yours as far as curl/wave pattern goes. I'm a bit flatter in the back, but curlier in the front (the front clumps hit 3a when things are going good).
2b-ish--embracing my waves this summer
Aussie Catch the Wave condish, L'Oreal NutriGloss condish; Nexxus Designing Texxtur Cream, Rusk Radical Creme, Pantene Curl Defining Mousse, Paul Mitchell Sculpting Foam; coconut oil for DTs