Concept:
Several anthropologists and ethnographers made important contributions to Indian anthropology through detailed studies of tribes and castes.
This question tests knowledge of:
• Anthropologists,
• Their ethnographic works,
• Communities studied by them.
Step 1: Matching W.H.R. Rivers.
W.H.R. Rivers is famous for his study of:
\[
\boxed{\text{Toda Tribe}}
\]
He conducted detailed ethnographic studies among the Todas of Nilgiri Hills.
Therefore:
\[
A \rightarrow IV
\]
Step 2: Matching S.C. Roy.
S.C. Roy is considered one of the pioneers of Indian anthropology.
He conducted important studies on:
\[
\boxed{\text{Munda Tribe}}
\]
Hence:
\[
B \rightarrow I
\]
Step 3: Matching L.K. Anantha Krishna Iyer.
L.K. Anantha Krishna Iyer is known for:
\[
\boxed{\text{Castes and Tribes of Cochin}}
\]
Thus:
\[
C \rightarrow II
\]
Step 4: Matching K. Krishna Iyer.
K. Krishna Iyer contributed significantly to:
\[
\boxed{\text{Travancore Tribes and Castes}}
\]
Therefore:
\[
D \rightarrow III
\]
Step 5: Writing the final matching combination.
The correct matches are:
\[
A \rightarrow IV
\]
\[
B \rightarrow I
\]
\[
C \rightarrow II
\]
\[
D \rightarrow III
\]
Thus, the correct answer becomes:
\[
\boxed{\text{(B) A-IV, B-I, C-II, D-III}}
\]