If x and y are complex numbers, then the system of equations $(1+\mathrm{i})\mathrm{x}+(1-\mathrm{i})\mathrm{y}=1,2\mathrm{ix}+2\mathrm{y}=1+\mathrm{i}$ has

• A

  unique solution

• B

  no solution

• C

  infinite number of solutions 

• D

  none of these