For the Last Decade, Value Foods Has Sold Frozen Vegetables

For the last decade, Value Foods has sold frozen vegetables in various types of sauces. In 2002, the company changed its packaging and began offering frozen vegetables in resealable bags with separate frozen-sauce pellets. In which of the new product categories would this new method of packaging frozen vegetables fall?

A) New-to-the-world products
B) New-to-the-firm products
C) Additions to existing product lines
D) Improvements and revisions of existing products