Explanation:

To determine the best conductor of electricity, we need to consider the properties of different materials. In this case, copper, silver, and aluminum are the options given.

1. Copper:
- Copper is a highly conductive material and is commonly used in electrical wiring.
- It has a low electrical resistance, meaning that electric current can flow through it with minimal hindrance.
- Copper also has good thermal conductivity, making it useful in heat exchange applications.

2. Silver:
- Silver is the best conductor of electricity among the three options.
- It has the highest electrical conductivity of any metal, even higher than copper.
- Silver has a very low electrical resistance, allowing electric current to flow through it with ease.
- Due to its high cost, silver is not commonly used for general electrical applications, but it is used in specialized applications where its exceptional conductivity is required.

3. Aluminum:
- Aluminum is a relatively good conductor of electricity but not as good as copper or silver.
- It has a higher electrical resistance compared to copper and silver, resulting in a slightly lower conductivity.
- Aluminum is lighter and less expensive than copper, which makes it a popular choice for electrical transmission lines.

Conclusion:
Based on the properties mentioned above, the correct answer is option 'B' - Silver. Silver has the highest electrical conductivity among copper, silver, and aluminum. However, it is important to note that copper is also an excellent conductor of electricity and is widely used due to its lower cost compared to silver. Aluminum, although not as conductive as copper or silver, is still a suitable conductor for many applications, especially in electrical transmission.