The correct answer is option 'B' - 5.

Explanation:
The 8085 microprocessor is a widely used 8-bit microprocessor architecture developed by Intel. It is a simple and basic microprocessor that was widely used in various applications.

The 8085 microprocessor supports a total of 5 hardware interrupts. These interrupts are used to handle various events and to provide a way for external devices to communicate with the microprocessor.

Here are the 5 hardware interrupts supported by the 8085 microprocessor:

1. INTR (Interrupt Request):
- The INTR input is used to request an interrupt.
- It is a non-maskable interrupt (NMI) that has the highest priority.
- It is generally used for critical events that require immediate attention.
- The microprocessor responds to the INTR signal by executing an interrupt service routine (ISR).

2. RST 7.5 (Restart 7.5):
- The RST 7.5 input is used to generate a maskable interrupt.
- It has the second-highest priority after the INTR interrupt.
- When the RST 7.5 signal is activated, the microprocessor jumps to memory location 003C (hexadecimal) to execute the ISR.

3. RST 6.5 (Restart 6.5):
- The RST 6.5 input is also used to generate a maskable interrupt.
- It has the third-highest priority among the interrupts.
- When the RST 6.5 signal is activated, the microprocessor jumps to memory location 0034 (hexadecimal) to execute the ISR.

4. RST 5.5 (Restart 5.5):
- The RST 5.5 input is used to generate a maskable interrupt.
- It has the fourth-highest priority among the interrupts.
- When the RST 5.5 signal is activated, the microprocessor jumps to memory location 002C (hexadecimal) to execute the ISR.

5. TRAP:
- The TRAP input is used to generate a non-maskable interrupt.
- It has the lowest priority among the interrupts.
- It is generally used for critical events that require immediate attention, similar to the INTR interrupt.
- When the TRAP signal is activated, the microprocessor jumps to memory location 0024 (hexadecimal) to execute the ISR.

These 5 hardware interrupts provide a way for the microprocessor to handle various events and communicate with external devices. By using these interrupts, the microprocessor can respond to critical events in real-time and perform the necessary actions accordingly.