Select all the statements that are true for the following systems of equations.
System A: 2x - 3y = 4 3x - 4y = 5
System B: 2x - 3y = 4 4x - y = 18
System C: 2x - 3y = 5 4x - 5y = 4
a) System A has no solution.
b) System B has a unique solution.
c) System C has infinitely many solutions.
d) Systems B and C have the same solution.