Long-term climate cycles are caused by all of the following except a) changes in ocean circulation b) variations in the shape of earth's orbit c) the slow movement of the continents d) earth's revolution of the sun

Two technicians are discussing oil changes. technician a says that waste oil and old filters need to be disposed of according to the law. technician b says that old filters can be returned to the parts department for a core value. which technician is correct?           a. technician a only   b. both technicians a and b   c. technician b only   d. neither technician a nor b