Answer:
c. an internal information search
Explanation:
She is most likely to involve in an internal information search to purchase toothpaste as well as mouthwash. Basically in internal information search, a consumer is given choice which is further understandable. And it is also connected with consumer's thinking power which is also known as the product's remembrance. So according to the statements which are given option (c) {which is "an internal information search"} is the correct option.