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The original contains a dangling modifier—it implies the keys were running late. The subject following the phrase must logically match the action. Choice A fixes this: “I left my keys.” The others keep the illogical subject problem. On ACT English, dangling modifiers are common traps. The solution is to ensure the modifier matches the intended subject.

The statement admits limitations but still emphasizes a “clear” trend. That suggests valid conclusions can exist even with gaps. Choice A is correct. Choices B, C, and D contradict. On ACT Reading, inferential questions require reading beyond explicit statements but still staying consistent with evidence.

Activity peaks at pH 7 (neutral) with 30 units, compared to 10 and 5 at extremes. Choice A is correct. B and C contradict data. D is false—pH clearly affects activity. ACT Science often tests recognition of an “optimum” condition.

The original is wordy. Choice A removes unnecessary phrases (“at this point in time,” “in the process of”) and keeps meaning intact. Choices B, C, and D retain redundancy. ACT English emphasizes concise and clear expression.

As volume doubles, pressure halves. This is Boyle’s Law (inverse relationship between pressure and volume). Choice B matches. A, C, and D contradict. ACT Science often tests recognition of direct vs. inverse proportionality.