The correct answer is D) Increasing ambient temperature increases local action. The reasoning is that higher ambient temperatures increase the rate of chemical reactions within lead-acid storage batteries, including the local action that can occur. Local action refers to the self-discharge of the battery due to small internal chemical reactions, which is accelerated by higher temperatures. This is because the increased temperature speeds up the electrochemical processes and leads to more local action and self-discharge, reducing the battery's charge capacity over time. The other options are incorrect because A) is false, as local action does not cease at 90°F, B) is incorrect as increasing temperature increases rather than decreases local action, and C) is incorrect as ambient temperature does have an effect on local action within the battery.