Which structure represents a phosphorylated subunit of glycogen as described in the passage?

The structure that represents a phosphorylated subunit of glycogen as described in the passage is D.
The increased calcium availability binds to the calmodulin subunit and activates glycogen phosphorylase kinase. AMP activates glycogen phosphorylase b by changing its conformation from a tense to a relaxed form. This relaxed form has similar enzymatic properties as the phosphorylated enzyme. 

Step-by-step explanation:

From the given information:

Since three sides of the garden need to be enclosed because the fourth side is a building.

The area is xy and the perimeter will be x + 2y

Calculating the perimeter in terms of x; we have:

P = x+2y = 232   (21)

y = (232 - x) / 2

y = 116 - (x/2)

Now; to calculate the area since the value of y in terms of x is known.

A = xy

A = x[116 - (x/2)]

A=116x - (x^2/2)   (2)

Taking the derivative of eqaution (2); we have:

A' = 116 - x

Relating it as it is equal to zero, thereby solving for x ; we have:

116 - x = 0

x = 116

From equation (1)

P = 116 +2y = 232

2y = 232 -116

2y = 116

y = 116/2

y = 58

Thus; the area A = xy can be calculated as:

A=xy

A=116(58)

A= 6728