Biofilms interrupt the flow of ions and water to and from the substrate surface by acting as a diffusion barrier. The re
The principle of quantitative reasoning explains that ratio, percentage and series logic determine correct calculation. Hence sulphides from SRB which cause the pitting of steel surfaces fits best because it meets mathematical and logical criteria, as documented in authoritative sources on aptitude and reasoning.
Ref: Agrawal, Quantitative Aptitude for Competitive Examinations, Chapter 5, Logical Reasoning and Probability, covers ratios, percentages, series completion, time-distance and analytical reasoning explaining problem-solving strategies for competitive assessments.
