It is true that many people infected with tapeworms maybe unaware of infection due to lack of symptoms.
The answer I believe is c.secondary
Usually they start of happy as the person begins to change later on in the relationship
But I am not sure but I think the answer is
C. Happy
Here are your answers.
C, D, A, A/C , C, C, D, D, D
I think for Question 14 it is the first option
for 15 i think it is option 3