Question

Consider the verb tense in the following sentence taken from the text. “Nuclear-powered rocket concepts are not new.” Choose the alternative in which the extract is in the same verb tense as the one above.

Accepted Answer

A) “Nuclear rocket engines generate higher thrust […]”.

Answer

B) “[…] this test facility will permit engineers to design rugged, efficient fuel elements and nuclear propulsion systems […]”.

Answer

C) “[…] the United States conducted studies and significant ground testing from 1955 to 1973 […]”.

Answer

D) “A first-generation nuclear cryogenic propulsion system could propel human explorers to Mars more efficiently […]”.

Answer

E) “Both materials were investigated in previous NASA and U.S. Department of Energy research efforts.”

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