Cetus is a very large constellation that can be readily recognized from the peculiar ____________ of its _______________ stars.
A. composition, prominent
B. conformation, principal
C. confirmation, predominant
D. configuration, principle
Answer is B.
For blank 1 we can use
confirmation, which means verification
configuration, which means arrangement
composition, which means make-up
conformation, which means shape or structural arrangement
Of these, we rule out confirmation, as "peculiar confirmation" doesn't make sense and 'composition of stars' implies chemical composition. The sentence states the constellation can be 'readily recognized' by this. As the chemical composition of stars is not obvious to any casual observer, 'composition' is also ruled out as a choice.
So we have options (d)configuration and (b)conformation as possibilities. So we need to choose between 'principle' and 'principal' for blank 2.
Principle= basic truth/rule of action or moral conduct
Principal= Chief/predominant
'principal' is the word that fits. Cetus can be identified by the peculiar arrangement of its important/main stars.