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Growth was highest at 100 mL (15 cm). Too little (50 mL = 10 cm) or too much (200 mL = 12 cm) gave less growth. Choice B matches. Choice A is wrong—200 mL didn’t outperform 100 mL. Choice C ignores data. Choice D contradicts results. ACT Science questions often require spotting an “optimum” value.

Substitute: f(4)=42−2(4)=16−8=8f(4)=4^2-2(4)=16-8=8. Correct answer: C, not A. Verification ensures accuracy. ACT function questions are straightforward—watch arithmetic steps.

Highest growth occurred at pH 7 (neutral). Choices B and C are incorrect; growth was lower at acidic (pH 5) and basic (pH 9). Choice D contradicts. ACT Science questions often involve identifying the optimum condition in an experiment.

Circumference = 2πr. 2π(9)=18π2π(9)=18π. Wait—check carefully: radius = 9 → 2×π×9=18π2×π×9=18π. Correct answer is A, not C. ACT Math requires close formula application; double-check radius vs diameter distinctions.

The correct idiom is “Despite” without “of.” Choice B is clear and concise. Choice A incorrectly uses “in spite” without “of.” Choice C mixes forms, producing an error. Choice D scrambles syntax. ACT English often tests idiomatic expressions—memorize correct pairings (“in spite of,” “despite”).