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You might find it more helpful to instead consider only two choices at a time and draw a grid:

          |  beef   | chicken |  fish   |
    ------+---------+---------+---------+
          |  beef   | chicken |  fish   |
    fries |    +    |    +    |    +    |
          |  fries  |  fries  |  fries  |
    ------+---------+---------+---------+
          |  beef   | chicken |  fish   |
    salad |    +    |    +    |    +    |
          |  salad  |  salad  |  salad  |
    ------+---------+---------+---------+



But the real takeaway here is that **textbooks below post-grad level (and maybe even at post-grad level) are intended for use with a teacher**. Online Q&A is not suited for methodically teaching through a textbook. You might do better with something like Khan Academy, Udacity, Udemy, etc.