TBR Biology #96, §8: Trouble reading graph (or is it a typo?)

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Gauss44

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96. Figure 1 indicates the breath hydrogen response to all 3 phases of the study.

Which of these statements could be supported by the data in Figure 1?

II. Lactulose promoted a rise in breath hydrogen beginning about an hour after it was given.

(Graph shows an increase in breath hydrogen beginning at exactly 60 minutes after ingestion. Answer key says, the rise began after 120 minutes. I don't understand how anyone could look at this graph and think that. The graph just clearly isn't in agreement with the answer key, unless I'm missing something.)

Is this a typo? Can you explain?

My book was copyrighted in 2010 if that helps anything.

Since this question relies on a graph, it's on page 255 of this pdf: http://www.scribd.com/doc/97990641/TBR-Bio2-Opt Moderators, feel free to erase that link if it's against the rules. I only posted it because the question relies on the diagram. Alternatively, I can erase the link once the question's answered.
 
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