Sea shells

This task is about reading information from a bar graph.
 
Shell Collection: Ohiwa Beach
bar graph of the number of different sea shells found at Ohiwa beach
 
Tanya collected different kinds of shells during a walk along Ohiwa Beach. Above is a bar graph of what she collected.

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a)  Which was the most common shell Tanya found?
     

Question 2Change answer

b)  Which shell did she collect the fewest of?
      

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c)  Tanya found about the same number of which two shells?
      and

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d)  How many more scallops than whelks did she collect?