a) 2 : 3 : 4
b) 4 : 3 : 2
c) 6 : 4 : 3
d) 3 : 4 : 6
Answer: c
Explanation:
$$\eqalign{
& \,\,\,{\text{A}}\,\,\,\,\,\,\,{\text{:}}\,\,\,\,\,\,{\text{B}}\,\,\,\,\,\,{\text{:}}\,\,\,\,\,{\text{C}} \cr
& 3 \times 4:2 \times 4:2 \times 3 \cr
& \,\,\,12\,\,\,\,:\,\,\,\,\,{\text{8}}\,\,\,\,\,:\,\,\,\,{\text{6}} \cr
& \,\,\,\boxed{\,\,6\,\,\,\,:\,\,\,\,4\,\,\,\,\,\,:\,\,\,\,3\,\,} \cr} $$
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