Two Pure Samples of Atoms, Labeled a and B, Contain

Two pure samples of atoms, labeled A and B, contain titanium (Ti) atoms and carbon (C) atoms, respectively. Each sample contains the same number of atoms. What is the ratio of the mass of sample B to that of sample A, m_B/m_A? Note the following atomic masses: C = 12 u; Ti = 48 u.

A) 1.0
B) 0.25
C) 2.0
D) 0.50
E) 4.0