Final answer:
To determine when a plane lands in Chicago, one must consider the flight duration, departure time, and any time zone differences. Without this information, it is not possible to select the correct answer from the given options.
Step-by-step explanation:
Without additional information on the flight duration, time zone differences, or the specific time the plane took off, it is impossible to determine the correct answer to the question 'What time will it be in Chicago when the plane lands?' The options provided are A. 12:30 P.M., B. 1:30 P.M., C. 2:30 P.M., D. 3:30 P.M., but without context, these options cannot be evaluated as to which one is correct. This type of problem often involves calculating differences in time zones and adding the flight duration to the departure time to find the arrival time at the destination.