Final answer:
The 'HH' format in the 24-hour clock would display 1:00 p.m. as 13.
Step-by-step explanation:
The format element that would display 1:00 p.m. as 13 is the 24-hour format using the 'HH' code. In this format, 'HH' represents the 24-hour clock where each hour is represented as a number from 00 to 23. So, 1:00 p.m. would be displayed as 13:00 in the 24-hour format. The question is addressing how to format a time to display 1:00 p.m. as 13. In order to display 1:00 p.m. in a 24-hour format without minutes, which is commonly referred to as 'military time', the elements of formatting you're looking for will be equivalent to using a 'HH' format, where 'HH' represents the hour in a two-digit 24-hour clock format. Out of the list provided, the correct format element that would display 1:00 p.m. as '13' is simply '13'. It seems that option '13.' is the closest correct answer, assuming the format element should display only the hour in 24-hour format without any additional symbols or numbers following it.