which sentence has a verb that is in the active voice in 1878 the world First Commercial Telephone Company was open by entrepreneurs in Connecticut

THIS is what you wrote, but it contains two errors -- that have NOTHING to do with your question. I will correct the errors and THEN answer your question.

YOUR sentence:  In 1878 the world First Commercial Telephone Company was open by entrepreneurs in Connecticut.

Corrected sentence:  In 1878, the world's First Commercial Telephone Company was opened by entrepreneurs in Connecticut.

Explanation:

As written, the sentence has no active verb.

The active voice version would read:

In 1878, entrepreneurs in Connecticut opened the world's First Commercial Telephone Company.

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hope this you.

the answer is camped