You are given two resistances `R_(1)` and `R_(2)`. By using them singly, in series and in parallel, you can obtain four resistances of `1.5Omega, 2Omega, 6Omega` and `8Omega`. The value of `R_(1)` and `R_(2)` are
A. `1Omega, 7Omega`
B. `1.5Omega, 6.5Omega`
C. `3Omega,5Omega`
D. `2Omega, 6Omega`