In non isosceles triangle ABC, D is the midpoint of BC and F is the midpoint of ab. the correct conclusion is that a AE: ad = 1:3, B △ abd is all equal to △ ADC, C △ abd is similar △ADC D △AEF=△CED

Choose D
A is obviously wrong, B is isosceles, C, angle ABC is not equal to angle ACB, not necessarily
D. ED is parallel to AB, the angle BAC = angle Dec, EF is parallel to BC, the angle AFE = angle fed, EF is parallel to BC, the angle fed = angle EDC, so the angle AFE = angle EDC, AE = EC, the △ AEF = △ CED

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