The example of dreamfields pasta shows:
a. how companies can encourage permissions-based email by offering incentives and rewards
b. how niche products create community
c. the benefits of expanding email marketing even if it requires a greater initial outlay.

a. How companies can encourage permissions-based email by offering incentives and rewards

Explanation:

The example of Dreamfields Pasta shows: how companies can encourage permissions-based email by offering incentives and rewards. E-mail marketing is cheaper than direct mail and has a very important role on mobile marketing. Offering incentives and rewards in an email can encourage permissions-based emails.  

i do believe that the correct answer is   (technical reasoning); luck

explanation:

productive most commonly means: achieving or producing a significant amount or result.

explanation:

productive can also mean:

these depend on how the word productive is used. most likely productive will mean   achieving or producing a significant amount or result.