In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.
Sorry to have(A)/troubled you; since(B)/it couldn't be helped.(C)/No error(D)
Tokyo officially became the Japanese capital after Emperor Meiji moved his seat to the city from the old capital of Kyoto in 1868; at that time Edo was renamed Tokyo.