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Solution
The correct option is D <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
aircraft <!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}-->
‘Binoculars’, 'sheep' and 'aircraft' are irregular plural nouns. They have the same singular and plural forms.