To solve the analogy problem, we need to understand the relationship between the words "SAIL" and "SHIP". A sail is a part of a ship that helps it move forward by catching the wind. The relationship here is that of component to whole.
Now, let's evaluate the options:
- Propeller : Dog: A propeller is not a part of a dog; hence this does not match the component to whole relationship as in "sail is to ship".
- Radar : Satellite: Radar is a system used by a satellite, but it isn't necessarily a component of it in the way a sail is inherently a part of a ship.
- Hydrogen : Balloon: Hydrogen is a constituent or filling used inside a balloon to make it float. This doesn’t match as well since a sail is part of a ship’s structure, not just a filling substance.
- Accelerator : Car: An accelerator is a part of a car that helps control its speed, directly analogous to a sail helping to propel a ship.
The option where a part (accelerator) is essential for the function of the whole (car) is the correct analogy. Adjusting our initial statement, we find the best relationship is actually: Accelerator : Car. Therefore, there seems to be a discrepancy in the provided answer. Based on logical deductions, the relationship parallels the original question better.