Answer:
Option D. ∠F < ∠D < ∠E
Explanation:
In the figure attached DEF, sides DE = 20 units, side EF = 35 units and side DF = 50 units
As we know angle of an opposite to the longest side is largest and angle opposite to the smallest side is smallest.
So sides of DEF can be arranged as DE < EF < FE
Therefore, angles opposite to these sides will be in the same order.
∠F < ∠D < ∠E
Option D. is the answer.