Answer: d) encourage product trial
Explanation:
Product trial is defined as the technique in which offering are made to consumers on temporary basis so that they can have information about the marketed product or service.This also tends the consumer to buy the product or service by testing product, checking samples, involving in offers ans scheme etc.
Other option are incorrect because awareness and expectation is not spread through temporary offerings. Re-seller support and improving the demand are not the technique for promoting products.
Thus, the correct option is option(d).
