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**Hint:**

A contour line of a purpose of 2 variable quantities is an arc along which the purpose has a continual value so that the arc joins points of identical value. It is a plane segment of the 3D graph of the function f(x, y) analogous to the (x, y)-plane.

**Complete answer:**

A contour map of worldwide crustal width displays the bimodal separation of the earth's crustal width. Ocean basins have $6 - 7$ km impenetrable crust (not counting $4 - 5$ km of water) and continents have an average width of $39.7$ km. The crust is characteristically 30 km impenetrable at the ocean-continent boundary and slowly surges toward the continental inland to $40 - 45$ km. The crust that is bushier than 50 km is constrained to a few areas, counting the Tibetan Plateau of western China, the Andes of western South America, and the Precambrian armor of southern Finland. The contour map only displays large-scale crustal structures; so, some areas of nearby impenetrable crust are not noticeable. The crust does not display a configuration of augmented width with age, as would be the case if it were recurrently exposed to igneous interruptions from the underlying mantle.

**Thus, option (D) is correct.**

**Note:**

You can tell how sharp a share of your graph is by how nearby the contour lines are to one another. When they are far apart, it takes a lot of adjacent remoteness to upsurge height, but when they are close, height upsurges rapidly for small adjacent augmentations. The level sets related to elevations that accost a peak of the graph will look like lesser and lesser closed coils, each one encircling the next. Similarly, for an upturned peak of the graph. This means you can mark the maximum or minimum of a purpose using its contour map by looking for sets of closed coils all-encompassing one another, like partisan concentric circles.

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