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45

Answers:

  proton(s) expected chemical shift
a) H1 und H5 d = 0.9 - 2.2 ppm
b) H2 und H6
c) H3
d) H4
e) CH-OH d = 2.6 - 5.3 ppm
f) -OH d = 1.3 - 5.1 ppm

There were actually two mistakes in your solution of the problem on page 48, because
  1. there are more then three signals in the NMR spectrum of isomer C
  2. there is no group with a signal at d = 9,9 ppm!
Go back and give it another try!