Statements A, B, C and E correctly describe the role of indexing and abstracting services in improving discoverability. Indexing connects researchers to relevant articles, abstracts summarise content, prestigious databases raise journal visibility and carefully chosen keywords make retrieval easier. Statement D is false because such services generally expand and organise access to literature rather than restricting it. Therefore, the combination that includes A, B, C and E and excludes D is correct.
Option A:
Option A is incomplete because it omits E, failing to mention the influence of author-selected keywords on search results. Without E, the active role of researchers in enhancing discoverability is underemphasised.
Option B:
Option B is correct as it unites the four true statements and rejects D, which wrongly advises avoiding indexing and abstracting services. It reflects how these tools support literature search and citation impact.
Option C:
Option C is wrong because it includes D and omits A, thereby suggesting that indexing restricts access and ignoring the basic function of indexing services in helping researchers locate literature.
Option D:
Option D is also incorrect since it accepts D and omits B, neglecting the summarising role of abstracts and misrepresenting how indexing and abstracting operate.
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