This statement is accurate. When bonds are redeemed to comply with a sinking fund provision or because of a property sale mandated by government authority, the redemption prices (typically par value) are referred to as "special redemption prices." When bonds are redeemed under the call provisions specified in the bond indenture, these are known as a regular redemptions and the call prices are referred to as "regular redemption prices."
The other statements are false. A sinking fund is a type of redemption, which refers to the retirement of bonds. An investor concerned about premature redemption would prefer a noncallable bond because a noncallable bond cannot be called for any reason. A bond that is callable but nonrefundable can be called for any reason other than refunding. The term refunding specifically means redeeming a bond with funds raised from a new bond issued at a lower coupon rate. A nonrefundable bond can be redeemed with funds from operations or a new equity issue.