1.Making a large angle with the plane of the horizon; ascending or descending rapidly with respect to a horizontal line or a level; precipitous; as, a steep hill or mountain; steep roof; a steep ascent; a steep declivity; a steep barometric gradient.

2.Difficult of access; not easy reached; lofty, elevated; high.
3. Excessive; as, a steep price. [Slang]
4. to soak; steeping a teabag
Give the definition number which means the same or about the same as the word steep as it is used in this sentence?
This island is the strongest in the world, with its steep rocks and great cliffs, and there is no metal in the island but gold.

A Definition 3
B Definition 2
C Definition 1
D Definition 4

B Definition 2

The definition number which means the same or about the same as the word "steep" as it is used in the provided sentence is:

C) Definition 1: Making a large angle with the plane of the horizon; ascending or descending rapidly with respect to a horizontal line or a level; precipitous; as, a steep hill or mountain; steep roof; a steep ascent; a steep declivity; a steep barometric gradient.

In this sentence, "steep rocks" and "great cliffs" indicate that the island has a steep and precipitous topography.

C Definition 1