1.1.3 The following factors were considered during the investigation: Number of volunteers (i) (ii) Time of day (iii) Repeat the investigation. (iv) The investigation must be done over a long period of time 3| Page Which ONE of the following combinations of factors will affect the reliability of the investigation? A (i) and (ii) only B (i), (ii) and (iv) only C (i), (ii), (iii) and (iv) D (i), (iii) and (iv) only ​