Answer: B
Robert is in the Evaluation of alternatives stage of the buyer decision process.
Explanation:
The various stages which consumers go through when they are considering a purchase are as follows:
Problem or need recognition , Information search , Evaluation of alternatives , Purchase , Post-purchase behavior
Evaluation of alternatives is the third stage in the Consumer Buying Decision process. In this stage, the consumers evaluate all their options based on the attributes of the products which is capable of delivering the benefit/ satisfaction that the consumer intends to get. Comparing the products (i.e different brands of products that is capable of satisfying the consumer needs), shows the alternatives being considered by consumers during the problem-solving process.
Therefore Robert, trying to choose between : Waterbags for Roadies, Supertanker Hydropacks, and Fast Water is in the stage of Evaluation of alternatives stage. Therefore the answer is B