An interesting poll I think because it doesn't explicitly state what type of reading matter the reader might be dealing with.
For example, if I was reading a large and complicated text then I would mostly be interested in the subject matter itself and for that purpose I am used to reading book print, typographical fonts so I would choose C.
If, on the other hand, I was reading a personal correspondence from a friend then I would rather they wrote in their own idiosyncratic hand (even if it meant that I had to work a little harder to understand them) and I would be....disappointed...if they were to resort to a print script simply because of a lack of confidence in the legibility of their cursive hand. So for personal correspondence - D or B.
My younger friends (teens and 20s) write with a blend of print and cursive which is generally very legible, I have an older friend I correspond with whose handwriting often has the appearance of a series of minor undulations on the page but it is still legible once I get into the swing of the style and I like the fact I can spot her hand from the other side of the room.