In academic research, the 'IMPACT FACTOR' (Journal Citation Reports) measures:

1. IMPACT FACTOR (IF) of a journal in a given year = (citations in that year to articles published in PRECEDING TWO YEARS) / (number of citable items published in PRECEDING TWO YEARS). 2. CALCULATED by Clarivate Analytics' Journal Citation Reports (JCR). 3. USED AS PROXY for journal QUALITY and INFLUENCE. 4. CRITICISMS: 5. (i) DISCIPLINARY BIASES — natural sciences have higher citation rates than law/humanities; 6. (ii) AGE BIAS — older articles have more time to be cited; 7. (iii) LANGUAGE BIAS — English-language journals dominate; 8. (iv) SELF-CITATION can inflate IF; 9. (v) Review articles cited more than research articles. 10. ALTERNATIVE METRICS: H-INDEX (Hirsch index); SJR (SCImago Journal Rank); ALTMETRICS (social media, downloads); FWCI (Field-Weighted Citation Impact). 11. INDIAN CONTEXT: UGC CARE list of approved journals; SCImago and Scopus indexed journals; many Indian law journals work toward inclusion in international indexes. 12. Hence option B is correct. _Source: Legal Research Methodology + Jurisprudence — Journal Impact Factor (JIF); Journal Citation Reports (Clarivate)_