Which of the following cable standards has a maximum effective range of 25 meters （82 feet）？（）

A.CO+2H₂ = CH₃OH+Q；CO₂+3H₂= CH₃OH+H₂O+Q
B.CO+H₂O = CO₂+H₂；4CO+8H₂ = C₄H₉OH+3H₂O
C.CO+3H₂ = CH₄+H₂O+Q ；CO₂+4H₂ = CH₄+2H₂O+Q
D.CO+2H₂ = CH₄+Q；CO₂+3H₂ = CH₄+H₂O+Q