Correct option is A
Given: c_bca_c_bc_b
Let's check all the options:
Option (a); abaa
c a b/ca b /c a b/c a b. (Follow the logical pattern)
Option (b); abcc
c a bca b c c bc c b. (Not follow the logical pattern)
Option (c); abac
c a bca b c a bc c b. (Not follow the logical pattern)
Option (d); abbc
c a bca b c b bc c b. (Not follow the logical pattern)
Here, logically follow the option (a)
Thus, the correct answer is option (a) abaa.