Correct Answer - A::B
`e_(A) sigma T_(A)^(4) = e_(B) sigma T_(B)^(4), (T_(A))/(T_(B)) = ((e_(B))/(e_(A)))^(1/(4))=3`
`T_(B) = (T_(A))/(3) =1934k lambda_(A)T_(A)=lambda_(B)T_(B)`
`lambda_(A)=(lambda_(B))/(3),lambda_(B)-lambda_(A)=1mum,lambda_(B)=1.5m` .