In triangle ABC, <B = 140, <C = 10
so <A = 180 - 140 - 10 = 30
In triangle DEF , <D = 30 and <F = 10
so <E = 180 - 30 - 10 = 140
Now you have
<A = <D = 30
<B = <E = 140
<C = <F = 10
Conclusion: triangle ABC is similar to triangle DEF
Answer is the last one.
