The correct answer is B) Fid. A fid is the tool used to open the strands of fiber lines when making an eye splice. The fid is a tapered tool, typically made of wood or metal, that is used to separate and spread out the individual strands of the rope or line, allowing the ends to be woven back into the line to create a secure and strong eye splice. The other answer choices are incorrect because: A) Belaying spike - used for securing lines, not for making splices C) Pricker - used for punching holes, not spreading rope strands D) Heaver - used for heaving or hauling lines, not for splicing