199. In a certain restaurant, if each soft drink costs the same amount, what is the cost, excluding sales tax, of 1 soft drink?
(1) The cost, excluding sales tax, of 5 soft drinks is $6.25.
(2) The cost, including sales tax, of 3 soft drinks is $4.05.

200. Mayor of Alberville: Factories in Alberville together emitted twenty percent less carbon dioxide in 2001 than in 2000. The decline in emissions was probably due almost exclusively to the March 2001 development of floating seaweed farms, the first step toward reducing carbon dioxide emissions that, in addition to being cost-efficient, was also widespread.

Scientists: That cannot be the cause. As you yourself clearly stated, carbon dioxide emissions were reduced by twenty percent. Yet seaweed farms can only absorb ten percent of Alberville factories' emissions.

Which of the following, if true, would most seriously weaken the force of the objection that the scientists present to the mayor's explanation?