Answer:
e. heterogeneity.
Explanation:
heterogeneity issue -
It is the uniqueness or the variability in the service offered .
The heterogeneous service is typically modified according to the needs of the consumers or the situations .
hence , from the question ,
The store found a solution for the consumer to find the product easily without any fuss , they installed kiosks , to direct them for searching .
hence , the answer to to given information is e. heterogeneity .