Question #6403678Single Choice

Writing and Reading

Question

Electric vehicles powered by hydrogen fuel cells suffer from a refueling problem. The challenge is to
recharge the hydrogen safely, quickly, and affordably. One way to do this is to store the hydrogen in safe
materials that release the hydrogen on demand via simple chemical reactions. The next question is how
to put the hydrogen back into the “spent fuel.” Hydrogen for fuel cells can be generated by the electrolysis of water. Scientists at Pacific Northwest National Laboratory discovered cobalt and nickel complexes that activate hydrogen, enabling the spent fuel to be recycled. An advantage to this method is that these materials are not precious metals, which have availability and cost issues.

The writer is considering deleting the underlined sentence.
Should the sentence be kept or deleted?

Options

Kept, because it makes an important distinction between the release and the generation of hydrogen.

Kept, because it establishes a context for understanding how electric vehicles work.

Deleted, because it contains information that interrupts the discussion of recharging fuel cells.

Deleted, because it contradicts a statement made earlier in the paragraph about the problematic nature of electric vehicles.

Answer & Analysis

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