Studies indicate that potential buyers of an expensive product are mor

Studies indicate that potential buyers of an expensive product are more likely to go through with their purchase if they have first made a purchase of a related product, such as an inexpensive product sold by the same company in the same place. Psychologists attribute this behavior to commitment bias, in which people's present actions are influenced by a desire to act consistently with their past actions. A company that sells expensive products will increase sales of these items by first inducing customers to buy inexpensive, easy-to-sell items.

Which of the following, if true, most strongly supports the interpretation of the studies?

Let's jot down the points:
studies->PB (potential buyer) -> mostly buy expensive product from same company if purchased inexpensive product earlier from same company and same place, and were satisfied.
Pschos-> commitment bias behavior
btw such companies do this on purpose to increase sales.

A. The effect noted in the studies applies to purchases made both in person and online.
INCORRECT. It doesn't strengthen the argument. it doesn't matter if the sales in offline or online.

B. Customers who have already declared their intent to purchase one item from such a company will not act on their intention by purchasing an inexpensive product in place of an expensive product
CORRECT. If customers are satisfied with the company, they don;t mind buying inexpensive product instead of expensive product and thus, this behavior will help increase sales of the company.

C. Not all companies that sell expensive products have inexpensive, easy-to-sell items available to sell.
INCORRECT. It no way strengthen the argument. Unnecessary information. Out of scope.

D. Commitment bias has been found to be equally strong for purchase made by cash and by credit card.
INCORRECT. A contender. But then it doesn't matter if the sales in done through cash or cc...since people have their preference to one company based on their purchase earlier, they won't mind purchasing from the same company again no matter how. hence, this sentence doesn't strengthen the argument.

E. The perception that buying an expensive product is consistent with a past purchase of an inexpensive item is strengthened if both of those products prominently feature the same company branding.
INCORRECT. this sentence does nothing to strengthen the argument, that is, to increase sales.

IMO answer is option B.