(1) Computer Processor Speeds Double Every Eighteen Months, So Business

Multiple Choice

(1) Computer processor speeds double every eighteen months, so business computers should be replaced every three years or so.(2) This amazing fact has been true since personal computers entered the marketplace.(3) So, these four-year-old computers on our desks ought to be replaced." Which is true about this argument?

A) (1) and (2) independently support (3)
B) (1) and (2) jointly support (3)
C) (2) and (3) independently support (1)
D) (2) and (3) jointly support (1)