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Bunuel
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Option D

Let's denote the center of each circle as A, B, and C starting from top left and moving clockwise.
Draw a straight line passing through centers A and B. This is gives us the one side of the rectangle. which is nothing but 4 times the radius. lets call it S1= 4.

Notice that the centers A B and C form an equilateral triangle with side 2.
drop a perpendicular from C on line AB. Lets say it meets at point O

for the triangle AOC
AC = 2; AO=1 and OC = \(\sqrt{3}\) (using Pythagorean theorem)

using these we can find the other side on rectangle \(S2= \sqrt{3} + 1 + 1\)

S2 = 2+ \(\sqrt{3}\)

Area = S1*S2

\(4*(2+\sqrt{3})\)
\(8+4\sqrt{3}\)
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Kindly see the attachment.

width = b
The length is calculated in the right side.
D
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