Indexing Journals Chronological Order

To arrange the indexing journals by their first publication year, we need to determine the debut year for each journal listed:

1. Index Medicus (c)

Index Medicus, a comprehensive index of biomedical literature, was first published in 1879.

2. Engineering Index (a)

The Engineering Index, covering engineering and applied science literature, began publication in 1884.

3. Humanities Index (b)

While the distinct Humanities Index title started later, its lineage traces back to the International Index, which commenced publication in 1907. This precursor covered humanities and social sciences.

4. Agrindex (d)

Assuming "Agrindex, Rome" refers to the Index Agriculturalis published by the International Institute of Agriculture in Rome, its first publication was in 1932.

Publication Year Summary

Here is a summary of the journals and their first publication years:

Chronological Arrangement

Arranging these journals from the earliest publication year to the latest gives the following order:

1. Index Medicus (c) - 1879
2. Engineering Index (a) - 1884
3. Humanities Index (b) - 1907
4. Agrindex (d) - 1932

Therefore, the correct sequence is c, a, b, d.