Question

under controlled conditions at the helios wind tunnel facility, engineers evaluated drag forces on three prototype turbine blades. the resistance measured for the composite model surpassed ____ design, even though both shared identical surface areas and rotational speeds during the 90 - minute trial. 18 mark for review which choice completes the text so that it conforms to the conventions of standard english? a that of the aluminum b those of the aluminum c the aluminum d those for the aluminum

Explanation:

To solve this, we analyze the noun we're comparing. The subject is "resistance" (singular), so we need a singular pronoun to refer to the resistance of the aluminum design. "That" is used for singular nouns, while "those" is for plural. Option A uses "that" to refer to the resistance (singular) of the aluminum design, which is correct. Option B and D use "those" (plural) which doesn't match the singular "resistance". Option C compares "resistance" to "the aluminum" (a material, not its resistance), which is illogical.

Answer:

A. that of the aluminum