On a smooth level surface, and with no forces acting on it after the moment of release, it MUST.
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Oh, dude, a sphere can't roll in a straight line. I mean, it's like trying to make a cat walk in a straight line - just not gonna happen. The shape of a sphere makes it roll in a curved path because of physics and stuff. So yeah, if you want something to roll straight, pick a different shape, like a cube or something.
Yes, a sphere can roll in a straight line if there is no external force or torque acting on it. When a sphere is rolling without slipping, its center of mass moves in a straight line while the sphere rotates about that center. This motion is governed by the principle of conservation of angular momentum and linear momentum.
The radius of a circle or sphere is a straight line from the centre to the edge.
a sphere
Diameter is the length of a straight line passing through the center of a circle or sphere and connecting two points on the circumference of the circle or the surface of the sphere. Circumference is the length of the closed curve of a circle.
A face.
The diameter of a circle or sphere is the length of a straight line that touches both sides and passes through the centre.