Artifacts that arise and affect the internal validity in res

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Artifacts that arise and affect the internal validity in research are:
(a) History
(b) Randomisation
(c) Maturity
(d) Instrumentation
(e) Experimental mortality
(f) Matching

[UGC NET 22 December 2018 (Paper - I)]

A (a), (b), (c) and (d)

B (a), (c), (d) and (e)

C (b), (c), (d) and (f)

D (d), (e), (f) and (b)