Riddle

I am round. I have only one line. Circle is not my name indeed. What am I?

Choose an answer

A.Circle
B.Ellipse
C.Sphere
D.Oval
Hint: It's a word with 4 letters, starting with "O".

Answer

Oval

Why this is the answer

An oval is a rounded shape with a single continuous outline, but unlike a circle, it's elongated rather than perfectly round.

This riddle is filed under "What Am I?" Riddles and rated Medium.