The answer is option b because I just know
The area of the <em>shaded</em> region of the rectangle is .
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How to find the area of the shaded area of a rectangle</h3>
The area for a rectangle is the product of width and length, the <em>shaded</em> area of the rectangle is found by subtracting the area of the <em>small</em> rectangle from the area of the big one. Thus,
The area of the <em>shaded</em> region of the rectangle is .
To learn more on rectangles, we kindly invite to check this verified question: brainly.com/question/10046743