Playwright A is credited with being the first playwright to break the convention of having one character converse with a chorus, by casting two lead actors in a play. Yet, Playwright B, who was born several decades before Playwright A, also incorporates this theatrical device in two of his plays. Which of the following, if true, best helps to account for the inconsistency noted above? ['Playwright A influenced the work of all of those playwrights born after him.', 'The work of Playwright B is credited with influencing the work of Playwright A.', 'The idea of including two actors on stage did not originate with Playwright A.', 'Playwright B and Playwright A died within one year of each other.']