Because CRT monitors are considered durable and

1. Because CRT monitors are considered durable and long-lasting, many experts believe that they will continue to sell readily. But who cares about durability these days? In the modern world where technological advancements are exponential, computer equipment is updated every other year while the need for its mobility is becoming ever urgent. LCD monitors are lighter than CRTs and are more practical.

The bolded sentences perform which of the following functions in the argument?

A: the first is the contention to be disproved while the second is the evidence that is used to disprove this contention
B: the first is the consideration against the author’s main position while the second is this position
C: the first refers to the opinion the author disagrees with while the second is the evidence that supports the unstated conclusion
D: the first is the statement to be argued against while the second is a piece of information the argument depends on
E: the first is the evidence in the argument which the author tries to refute while the second is the author’s main conclusion