I think (B) was probably the closest, but I wouldn't say that "much of it was at 10 race pace".
I was a bit sneaky though, you see. I got out for a shade under seven easy kilometers in the morning. Then I did an easy 6 km warm up tonight. Then a 10 km tempo run on the track (and we were just about there weren't we?) and then another couple of easy kilometers to cool down, just to make sure. So a lot of it was really at easy pace, and I think that was my crowning glory of common sense. And it was all directed around making sure I could do justice to the schedule 10 km tempo run. But end result, ta daaaa .. 503.0 ... 100 meters less than last month! Shit, what's the time? Where are my shoes?
And boy, wasn't that tempo run a weird thing. From my HRmax, I judge my lactic threshold to be up around heart rate 160 to 165. And based on current fitness and recent heart rates etc, I figured I could target 3:55/km to 4:00/km as being about right to get me to that heart rate after a few kilometers; It wasn't. I had Joachim for company (him fresh off a 78 minute half last weekend!) and we really got into a good rhythm. As good as you can on a track as crowded as Oda Field on a Wednesday night. By 5k we had averaged 3:58/k and my average heart rate had only got up to 153. Then we turned the screw to low 3:50s and my heart rate was up to 156/157. The last two km were a 3:50 and a 3:43 to come in at 38:59 (rounding errors in the log splits made it 39:01 ... phooey). It was only in the 9th km that I really felt my breathing go up that extra notch. So it seems I probably need to be under 3:55, close to 3:50, to really reach into my lactic threshold. That's a really good thing. Now if only my legs and back and everything else would just cooperate!!
Oh, and the Tarthers were beautiful! I think they'll be OK in the marathon despite how light they are.