Final answer:
The total number of electronic systems in the boxcar is six, as stated in the question. Therefore, the correct answer is option 2) 6.
Step-by-step explanation:
The student asked about the total number of electronic systems in a boxcar, stating that it contains six complex electronic systems. The answer is straightforward: if a boxcar contains six electronic systems, then the total number of electronic systems is exactly six. There is no need for further calculations or considerations. Hence, the correct answer is option 2) 6.