Final answer:
The given solution does not address the initial question about the length of a line attached to a life ring and instead calculates the length of fishing line in meters based on given constants and radians.
Step-by-step explanation:
The student's question revolves around determining the length of a line attached to a life ring, stated in a multiple-choice format without providing a specific context or calculation. However, the reference provided discusses a totally different question about the length of fishing line in meters related to a constant (r) and radians (rad). The number of meters of fishing line being x, calculated as r0, is found using the equation x = (0.0450 m)(220 rad) = 9.90 m. This answer, however, does not correlate with the question asked, which requires information about a life ring's line length instead.