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Directions to Solve

In each of the following letter series, some of the letters are missing which are given in that order as one of the alternatives below it. Choose the correct alternative.

16. 

ab _ aa _ bbb _ aaa _ bbba
A. abba
B. baab
C. aaab
D. abab
17. 

_ nmmn _ mmnn _ mnnm _
A. nmmn
B. mnnm
C. nnmm
D. nmnm
18. 

a _ n _ b _ _ ncb _ _ ncb
A. abbbec
B. abebeb
C. bacbab
D. bcabab
19. 

a _ ba _ b _ b _ a _ b
A. abaab
B. abbab
C. aabba
D. bbabb
20. 

cccbb _ aa _ cc _ bbbaa _ c
A. aebe
B. baca
C. baba
D. acba