Question: Meteorologists categorize hurricanes based on the Saffir-Simpson scale. The scale measures the intensity and destructive potential of hurricanes. Which factor has the most significant effect on the strength of a hurricane?

What is the correct answer to the question from the following choices?
Choices: [i] the initial speed of a hurricane. [ii] the direction that the hurricane rotates. [iii] the number of hurricanes that form in a year. [iv] the temperature of the water below the hurricane.
[iv]