Figures such as these
a) are used by epidemiologists in the assessment of a toxicant's effect
b) are used by scientists in risk assessment
c) are used to report the effects of a toxicant on wildlife populations
d) represent typical dose-response curves for endocrine disruptors
e) allow scientists to determine the exact quantity of a toxicant that will harm humans

(a) The interior of the cell will become less negative.

Explanation:

The normal resting membrane potential is about -70 mV. This voltage is maintained by the potassium (K+) leak channels which allows leakage of potassium ions to the extracellular. The leakage counteracts the effects of the Na+K+ pump which increases the concentration of these positively charged ions intracellularly. Therefore the blockage of potassium leakage pumps will make the membrane potential less negative.