Answer:
Given is -Because he only wants the best for his daughter, he immediately buys the new brand even though it’s a bit more expensive.
Here, the technique used by the seller is his way and art of using attractive keywords and phrases such as all natural and no preservatives.
Before making the purchase, the step Mike could have considered is, comparing the ingredients of both the baby foods.
It might have been possible that the previous baby food also had no preservatives and it was also natural.