Like many, it seems, I prefer options C and E.
Ideally, it would be a combination of the two. Despite the ascension and ease of use of the tablet, there is still much to enjoy about possessing a hard copy of a work. Many of the technologically-savvy, myself included, find much joy in collecting hard copies of golf course architecture's great works.
Option C would be a great series for the collector, allowing coverage of ALL the courses you've seen, 0-10. I would be disappointed with the exclusion of all courses below a "5". I believe the average enthusiast can learn just as much about golf course architecture from exploring why a 2 is a 2 as they can from why a 10 is a 10, with much less need for "access."
Ignoring the elephant in the room (aka technology), would be a missed opportunity, IMO. Echoing many responses, my iPad makes for a much more handy travel companion than a book does and I, for one, would certainly purchase the combination package, if offered.
I think the fair way to market this combination would be to offer Option E as a complimentary add-on to the purchase of Option C, while also allowing for the purchase of Option E without the purchase of Option C for those who could care less about the hard copy. Obviously, the C+E combo would be more costly than E-only. I would resist double charging the hard-copy buyer who also wants the online edition, though.