Answer:
d. By competing in the same strategic group, the two companies are dealing with customers who view their products as direct substitutes for each other
Step-by-step explanation:
Mattel and MGA Entertainment are direct competitors, and when it comes to the doll market, even more so because each company is offering a product that is almost a perfect substitute of the other.
Both Barbie dolls and Bratz dolls are toys that appeal mostly to young girls, and that have a fashion element to them. This is the same situation as Sony and Microsoft in the videogame console market.