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Sorry, wrong answer!

Go back and have another look at the isomer. Follow the approach out-lined on page 19:
One option is to analyze the remainder of the molecule from the view point of each single proton, for example from H1 and H3.

Formelschema 1

H1 and H3 obviously have entirely identical environments. They should give rise to a single signal.

Alternatively you can use the symmetry of the molecule.
Did you notice that this isomer has a symmetry center i?

Formelschema 2

For example, H1 and H3 exchange positions upon inversion (i)

Continue this analysis and decide which protons are equivalent, as well as how many signals you can expect in the spectrum of this isomer!

When you are done, move on to page 39!