Forest areas have been labelled as 1, 2, 3 and 4 in the rough outline map given: Among these, those which were threatened in 1997 by a serious epidemic include

1. The question asks to identify forest areas threatened by a serious epidemic in 1997 from the map. 2. Location 1 appears to be in the Western Himalayas (perhaps Oak forests). Location 2 is in the Eastern Himalayas/Northeast (potentially Sal forests). Location 3 seems to represent Central India (possibly Sal or Teak forests). Location 4 represents the Western Ghats/Southern India (known for Sandalwood, Teak). 3. In the late 1990s, there were reports of a serious disease or pestilence affecting Sal forests in Central India (Madhya Pradesh, parts of Orissa). This corresponds geographically to Location 3. 4. The 'Sal borer' insect infestation caused significant damage to Sal trees in this region around that time. 5. Option (C) correctly identifies the Sal forests of 3 as being threatened.