The correct answer is C) Eye splice. The eye splice is the preferred method for creating a permanent loop in a line or rope. It involves weaving the end of the line back into the standing part of the line, forming a strong, secure loop or eye. This type of splice is commonly used to create permanent attachments, such as on the end of a line or to form a loop for a thimble. The other options are not the best choices for creating a permanent loop. The long splice and back splice are more suitable for joining two lines together, while the short splice is typically used to temporarily join two lines.