Johnny of the Taxi Co

Johnny of the Taxi Co.,runs a tight business,demands high standards of his drivers and keeps his cabs in excellent working condition.However,he cannot predict when one of his 38 cabs will break down or get a flat tire and how much it will cost the company - not to mention the irate customer.Johnny has ________.

A) transaction uncertainty
B) buying uncertainty
C) market uncertainty
D) need uncertainty