The total percent of land in world under forest area is

$\text{Correct option: B}$

$\text{Solution:}$

Option B:

$?$ Approximately $31\%$ of the total global land is covered by the forests, $10\%$ by glaciers and $19\%$ by barren land.

$?$ It has been analyzed that forest area has been reduced up to half from past 10,000 years.

$?$ This reduction in forest covered area occurs due to expansion in agricultural land.

$?$ In the present time, there is about $47\%$ of habitable land is used for agricultural purposes (including grazing areas of livestock) whereas only $38\%$ is under forest area.

Hence the correct option is option B.