Answer:
Prepare to go on stage <u>once I tell you when the best time is.</u>
Explanation:
An adverb clause is a group of related words that have at least a subject and a verb, and whose function is to act as an adverb, that is to say, to modify or add detail to adjectives, verbs or other adverbs. This type of clauses often answers questions such as "Why?", "How?", "When?", "Where?" and "In what circumstances?".
In the provided sentence, the adverb clause is "once I tell you when the best time is" as it modifies the main action "to prepare to go on stage", and answers the question "When should you prepare to go on stage?".
W. E. B. Du Bois demonstrated that limited opportunities and racism shaped every aspect of the lives of African Americans. Africans were discriminated against in various spheres and as a result were limited in the extent they could advance themselves
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A. It established England as a world power.