What Is Angle Strain in Cycloalkanes

What is angle strain in cycloalkanes?

A) Angle strain is the angle between carbon bonds on the outer side of a cycloalkane ring.
B) Angle strain is the difference between an ideal bond angle for sp³ hybridized carbon atoms and the actual bond angle in the ring.
C) Angle strain is the difference between and ideal bond angle for sp hybridized carbon atoms and the actual bond angle in the ring.
D) Angle strain is the angle between C-C bonds in the cycloalkane ring.
E) Angle strain is the difference between the C-C bond angles found in a flat ring structure and in an actual ring structure.