Final answer:
The provided information does not specify what qualifies someone as a heavy user of McDonald's, nor does it link fat consumption to McDonald's visits; hence, we cannot determine what percent of people are heavy McDonald's users from the given data.
Step-by-step explanation:
The question "What percent of people who eat at Mc Donald's, at least once a week, are heavy users?" is a typical example of a statistical or probabilistic query that may pertain to a study or survey. However, the information provided does not contain data specifically related to the frequency of McDonald's visits or the subsequent classification of "heavy users" based on that frequency. Therefore, we cannot directly calculate or infer the answer from the given percentages which pertain to fat consumption and unrelated statistics.
Thus, without additional specific data regarding McDonald's consumers, it would be incorrect to assume any of the options (A) 10%, (B) 25%, (C) 50%, or (D) 75% represents the correct percentage of heavy McDonald's users based on the information provided.