Option 1 -> This refers to recent global market entry, not when contributions began.
Option 2 -> Attaining independent status is a later development, not the starting point of contributions.
Option 3 -> The passage explicitly states writers have been making "momentous and considerable contributions to world literature since the Pre Independence era."
Option 4 -> Recent years show prospering and thriving, but contributions started much earlier.
Hence, Option 3: Pre-Independence era -> The passage directly mentions that Indian writers, poets, novelists, essayists, and dramatists have been making considerable contributions to world literature since the Pre-Independence era, making this the correct timeline for when these contributions began -> correct