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ABCD is a trapezium with parallel sides ...

`ABCD` is a trapezium with parallel sides `AB=a` and `DC=b`. If `E and F` are mid-points of non-parallel sides `AD and BC` respectively, then the ratio of areas of quadrilaterals `ABFE and EFCD` is:
(a) `a : b`
(b) `(a+3b):(3a+b)`
(c) `(3a+b):(a+3b)`
(d) `(3a+b):(3a+b)`

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