If the clock shows 9:26 PM, what is the time in 24-hour format?

To convert the time from a 12-hour format to a 24-hour format, you need to add 12 to the hour if it is in the PM (after noon) and keep the minutes the same. In this case, it is 9:26 PM.

Since 9 PM is in the PM period, you add 12 to the hour:

9 (PM) + 12 = 21

The minutes stay the same, which is 26. Therefore, the time in 24-hour format becomes 21:26.

Expressing this as a four-digit number, it would be represented as 2126. Therefore, the correct conversion of 9:26 PM into 24-hour format is indeed 2126.