Solutions
'her idea has merit' - 'fo la bu na'…….1)
'merit list has been displayed' - 'jo ke la si na'…….2)
'her name displayed there' - 'ya si bu zo'…….3)
'name in merit list' - 'na ya go ke'…….4)
From 1) and 3) her-bu
From 1) and 2) merit-na
From 1 and 2) has-la
So the code for ‘idea’ is –fo
From 2) and 4) list-ke
From 3) and 4) name-ya
From 2) and 3) displayed-si
From 1), 2), 3) and 4) there-zo
From 1), 2), 3) and 4) in-go
From 1), 2) and 3) been-jo
‘ke’ stands for ‘list’. So answer is 5).