Final answer:
The correct format element to display 1:00 p.m. as 13 is 'A) HH24', which represents a 24-hour clock format. The other options, HH12, MI, and PM, do not convert 1:00 p.m. to 13 in the desired format.
Step-by-step explanation:
The format element that will display 1:00 p.m. as 13 is A) HH24. This format is used in 24-hour clock time representations, also known as military time, where times from 1 to 12 p.m. are represented as 13 to 24. None of the other options, HH12, MI, or PM, would properly convert 1:00 p.m. to 13. Option B) HH12 would display the hour in a 12-hour format, which would not convert 1:00 p.m. to 13; it would display it as 01. Option C) MI stands for minutes that would display the minute portion of the time, so it's not relevant to displaying the hour. Lastly, option D) PM simply indicates whether it's before or after midday and does not contribute to the hour number in a 24-hour format.