Francis ought to have made more effort to locate his brother.

a-francis was able to track down his brother due to the effort he made.
b-İt is necessery for Francis to try harder if he wants to locate his brother.
c-Francis didi't try as hard as he should have to find his brother.
d-Francis must have worked hard in order to locate his brother.
e-Francis has made to make the effort himself if he wishes to find his brother.
ELS

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Cevap, C olacak.

should have done=ought to have done

Francis ought to have made more effort to locate his brother.

a-francis was able to track down his brother due to the effort he made.
b-İt is necessery for Francis to try harder if he wants to locate his brother.
c-Francis didi't try as hard as he should have to find his brother.
d-Francis must have worked hard in order to locate his brother.
e-Francis has made to make the effort himself if he wishes to find his brother.

Ought to have done = Should have done

A olmaz. Yapabildi diyor...
B olmaz present ve gerekli demiş ve if koymuş...
D olmaz...Çok sıkı çalışmış olmalı diyor...Böyle bilgi yok...Çalışmalıydı diyor ana cümlede...
E olmaz...Efoır gösterdi diyor ama ana cümlede elinden geleni yapmalıydı (yapamadı ki kardeşini işe yerleştiremedi anlamı var)

C uygundur...