Experts hired to testify in court need to know how to make convincing presentations. Such experts are evaluated by juries in terms of their ability to present the steps by which they arrived at their conclusions clearly and confidently. As a result, some less expert authorities who are skilled at producing convincing testimony are asked to testify rather than highly knowledgeable but less persuasive experts. Which one of the following most closely conforms to the principle illustrated by the passage above? ['Trial lawyers often use the techniques employed by actors to influence the emotions of jurors. Many lawyers have studied drama expressly for the purpose of improving their courtroom skills.', 'The opera singer with the best voice is the appropriate choice even for minor roles, despite the fact that an audience may be more affected by a singer with greater dramatic ability but a lesser voice.', 'Successful politicians are not always the ones who best understand how to help their country. Some lack insight into important political issues but are highly skilled at conducting an election campaign.', 'Job applicants are usually hired because their skills and training best meet a recognized set of qualifications. Only rarely is a prospective employer convinced to tailor a position to suit the skills of a particular applicant.']