A student has collected these notes about Adam Volkov's paper-conservation adhesive: - Researcher Adam Volkov studied adhesives used to repair torn paper artifacts. - Some strong adhesives made later repairs difficult because they could not be removed safely. - Volkov formulated a reversible adhesive that can be softened with mild humidity. - Conservators used it on maps, letters, and theater posters. - Volkov's contribution was making paper repair more adaptable to future conservation needs. The student wants the next sentence to emphasize Adam Volkov's contribution to paper conservation. Which choice best accomplishes the student's goal?