BARREL:GUN::DIAL:

BARREL:GUN::DIAL:

• A. clock
• B. channel
• C. number
• D. hand

Answer: (A)

The relationship between the first pair, "BARREL" and "GUN," is one of component to whole, where the barrel is an essential part of a gun. To maintain this parallel structure in the second pair, you need to identify which option is a crucial part of a dial.

In this context, a dial serves as a mechanism found on a clock. A clock has a face or surface that displays time, and the dial is the rotating part that is used to set or show the time. This similarity means that, just as a barrel is integral to a gun, a dial is an integral part of a clock.

The other options do not present a similar relationship where one is a critical component of the other. "Channel" can relate to various contexts and does not fit as a necessary part of a dial. "Number" could be associated with a dial but is not a part of its physical structure. "Hand" can refer to the hands on a clock but does not represent the dial itself. Thus, the connection of a dial to a clock is the strongest and best fits the analogy given.