Step 1: Understanding the Question
The question asks to identify which of the given options is a type of grassland that is \textit{not} found in the tropics.
Step 2: Classifying the Grasslands
(A) Savanna: These are the classic tropical grasslands, most famously found in Africa, characterized by scattered trees and shrubs.
(B) Campos: These are tropical grasslands found in Brazil, South America.
(C) Llanos: These are tropical grasslands found in Venezuela and Colombia, South America.
(D) Steppe: This term refers to the vast, treeless temperate grasslands, typically found in southeastern Europe and Asia (Eurasia). They are temperate, not tropical.
Step 3: Final Answer
Savanna, Campos, and Llanos are all examples of tropical grasslands. The Steppe is a temperate grassland. Therefore, Steppe is the correct answer. Option (D).