After answering a summons and complaint, Mike received a set of written questions from the plaintiff's attorney. He was directed to respond to the questions in writing under oath. This discovery technique is called?

interrogatories

Explanation:

Based on the scenario being described within the question it can be said that this discovery technique is known as interrogatories. In the context of law, interrogatories are a set of written question that have been formally created and are used in order to help determine which facts regarding the case will be presented and used in the upcoming trial.

well i'm late but i think its: b, c, and e

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.