Explanation:

Let's break it down:

- d: Introduces power foods and their nutrient benefits.

- a: Mentions how fitness trainers encourage the inclusion of these foods for muscle building.

- b: Describes ways to incorporate power foods into your daily diet.

- c: Talks about the secrets to maximizing the benefits of power foods through cooking and selection techniques.

Now, let's evaluate the options:

- Option 1 (d, b, c, a):

- Starts well with defining power foods,

- But jumps to how it can be included in a diet without establishing why that's important.

- Option 2 (d, a, b, c):

- ?? Correct order.

- Starts with introduction, explains relevance, then methods of inclusion and cooking tips.

- Option 3 (b, c, a, d):

- Ineffective order. Starts with methods before defining power foods.

- Option 4 (a, d, b, c):

- Misplaces the introduction and starts with reasons for using power foods.