It comes $4+4=8$ when we count Amy twice.  The number of all singing students is $4+4-1=7$ 
Several students are singing in a line. Amy is the fourth one from the left. From the right, Amy is the fourth too. How many students are singing? (adapted from $$2019$$ Math kangaroo Problems, Level $$1-2$$, Question \#$$5$$) 
A) $5$ 
B) $6$ 
C) $7$ 
D) $8$ 
E) $9$ 