it should be opt (a).
0*(10*)* =∈,0,1,10,010,0010,100...........
a. (1*0)*1*= ∊,1,0,10,110,101,1011,110.......it is generating same set of strings by using shifting property
b. 0 + (0 + 10)* = 0,10,010 .......... it is not generating ∈
c. (0 + 1)* 10(0 + 1)* = 10,010........... it is not generating ∈