Based on the fact that Mott's is now selling more apple-based products, we can say that they increased their a. product line depth
The product line depth of a company refers to the number of sub-products it sells under one category. In this case, Mott's sells a variety of apple based products which can be considered to be sub-products under the apple category.
The other options are wrong because:
In conclusion, Mott's increased their product line depth.
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Options for this question include:
a. product line depth
b. product mix breadth
c. product line breadth
d. product mix depth