Answer:
Planning and colorful and interactive with a focus on audience participation are the correct answers.
Step-by-step explanation:
As a verb, design means to plan how something will work and make a graphic representation of it. Even the other options are also related to the word "design" in one way or another, the most accurate answer is b.
In the second question, letter A is correct; since the atmosphere is casual, an interactive and colorful presentation is good for this situation. Another factor to consider is that the context encourages group activities, so audience participation is desired in this kind of presentations.