Answer:
The correct answer is A that is substitution bias
Explanation:
Substitution bias is the bias in the economic index numbers, if that do not incorporate the data on the consumer expenditures then the customer will switch from relatively more expensive products or items to the cheaper ones due to the change in the price.
As, the price of that produce has increased so, the customer shifted or preferred to buy the product which is cheaper in price. Therefore, it is referred to as the Substitution bias.
