The authors states: nevertheless, although undeniably a shrewd politician, an exceptional general, and an insightful administrator, he owed his lasting success not to superior ability in any of these areas over nobunaga or hideyoshi, but to personal longevity and judicious institutional borrowing. born within a decade of his erstwhile overlords, he outlived nobunaga by thirty-four years and hideyoshi by eighteen. the authors credits ieyasu success to his longevity. does the author support this claim with an adequate explanation? a. the author provides an in-depth explanation to his claim that success was due to longevity. b. the author merely mentions the years ieyasu outlived his counterparts but does not provide enough evidence to support his claim. c. the author does not provide much information but he is able to explain his reasoning quite well.