To solve this question, the user needs to know about the Interrupt Request (IRQ) system and how it applies to the LPT1 (Line Print Terminal 1) port.

LPT1 is a parallel port commonly used for printers and other similar devices. In terms of IRQ, it typically uses IRQ7.

Now, let's go through each option and explain why it is right or wrong:

A. 1: This option is incorrect. IRQ1 is typically used for the keyboard controller.

B. 4: This option is incorrect. IRQ4 is typically used for the serial port COM1.

C. 5: This option is incorrect. IRQ5 is typically used for the sound card.

D. 7: This option is correct. LPT1 commonly uses IRQ7.

E. 8: This option is incorrect. IRQ8 is typically used for the real-time clock.

Therefore, the answer is: D.