Three years from now, Dathan's age will be d + 3, Ellen's will be e + 3, and Famke will be f + 3. Thus, three years from now, (d + 3) = 3(e + 3), and (e + 3) = (f + 3) - 6. We also know that d = 2f - 3 from the last sentence. Line up and simplify the equations:

d + 3 = 3e + 9, or d = 3e + 6
e + 3 = f - 3
d = 2f - 3

Since the first and third equations are set equal to d, combine them:
3e + 6 = 2f - 3

Now there are two equations, each of which has the same two variables, e and f:
e + 3 = f - 3, or e = f - 6
3e + 6 = 2f - 3

Substitute the value of e from the first equation into the second:
3(f - 6) + 6 = 2f - 3
3f - 18 + 6 = 2f - 3
3f - 9 = 2f
f = 9, choice (A).