Nobody knows for sure, but it's believed that the balls ...

[ Grammar ]

Nobody knows for sure, but it’s believed that the balls ___ by the ancestors of native people.
A. could have been made
B. could be made
C. could have made
D. could have be made

Select your answer:
A B C D E

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Possessive Adjectives Connectives (because, due to, owing to, because of)Perfect and Past Tense Preposition Form Zero & First Contidional Past and Present Continuous tense Adjectives and Adverbs Subjective and Objective Pronoun Reflexive pronouns Tenses: Present simple, Past Simple, Future Simple

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