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Which option completes the text below correctly?
Air Force's first Grey Wolf patrol helicopter arrives at Malmstrom
The first field-ready MH-139 Grey Wolf arrived at Montana's Malmstrom Air Force Base earlier this month, marking the start of operations for a new fleet of aircraft designed to safeguard America's land-based nuclear missiles.
The MH-139 Grey Wolf helicopter, ______ replaces Vietnam War-era Hueys, will be used to patrol the intercontinental ballistic missile fields at Malmstrom; F.E. Warren AFB, Wyoming; and Minot AFB, North Dakota.
(Adapted from https://www.militarytimes.com)
Air Force's first Grey Wolf patrol helicopter arrives at Malmstrom
The first field-ready MH-139 Grey Wolf arrived at Montana's Malmstrom Air Force Base earlier this month, marking the start of operations for a new fleet of aircraft designed to safeguard America's land-based nuclear missiles.
The MH-139 Grey Wolf helicopter, ______ replaces Vietnam War-era Hueys, will be used to patrol the intercontinental ballistic missile fields at Malmstrom; F.E. Warren AFB, Wyoming; and Minot AFB, North Dakota.
(Adapted from https://www.militarytimes.com)
Resolução comentada
Pronome relativo não restritivo para coisa: which.
A oração entre vírgulas 'which replaces Vietnam War-era Hueys' é explicativa e se refere ao helicóptero, uma coisa. Nesse caso usa-se 'which'.
Análise das alternativas
'What' não funciona como pronome relativo aqui. 'Who' e 'whom' são para pessoas. 'Whose' indica posse, o que não faz sentido na frase.
Referência: Gramática inglesa – relative clauses
Resolução comentada do VaiConcursos.