Which one among the following covers the highest percentage of forest area in the world?

The correct choice is Temperate Coniferous forests. A book source explicitly states that “at the global scale, temperate coniferous forests cover the highest percentage” of forest area, directly identifying this biome as the largest contributor globally [1]. This dominance is consistent with global forest distribution data showing that very large contiguous forest regions — notably those in the high-latitude and temperate zones (for example, the extensive forested area of the Russian Federation and other northern countries) — make up a substantial share of the world’s forest area, reinforcing why conifer-dominated temperate/boreal forests represent the largest biome by area [2].

Sources

1. [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 30: Climatic Regions > Explanation: > p. 468
2. [2] https://ourworldindata.org/forest-area