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: at a certain conference, 78 % of the attendees registered at least two weeks in advance and paid their conference fee in full. if 10 % of the attendees who paid their conference fee in full did not register at least two weeks in advance, what percent of conference attendees registered at least two weeks in advance ?
Options: a. 18.0 %, b. 62.0 %, c. 79.2 %, d. 86.67 %, e. 82.0 %
d