Given a math problem with context and a question and 5 answer choices, the task is to provide the correct answer choice based on the problem. You must choose one of the given answer choices by letter: a, b, c, d, or e; anything else is invalid.

Problem: an industrial loom weaves 0.128 metres of cloth every second. approximately, how many seconds will it take for the loom to weave 25 metre of cloth ?
Options: a. 194 seconds, b. 195 seconds, c. 196 seconds, d. 197 seconds, e. none of these
b

Problem: 54671 - 14456 - 31466 = ?
Options: a. 2449, b. 5449, c. 8749, d. 8449, e. 6468
c

Problem: if a drawing has an outer circle of diameter 30 and an inner circle of diameter 24, then what fraction of outer circle ' s surface is not covered by the inner circle ?
Options: ['a. 3 / 6', 'b. 8 / 24', 'c. 14 / 16', 'd. 9 / 25', 'e. 2 / 3']
d