When calculating the surface area of a sphere, which of the following statements best captures the conceptual challenge mentioned in the explanation?
a) The difficulty arises from the inability to trace or lay a flat piece of paper onto the curved surface of a sphere.
b) The problem lies in converting the three-dimensional nature of a sphere into a flat, two-dimensional representation.
c) The challenge is primarily related to the irregular shape of the sphere, making it impossible to use standard measuring tools.
d) The key issue is the inability to unfold a sphere into simple 2D shapes, as can be done with cones and cylinders.
