Based on the figure, a sound of a given frequency will have the highest intensity for which of the following sets of conditions?
Sound is passing through； S

A.
1.
B.
2.
C.
3.
D.
4.
E.
5.
F.Two
G.6-solar-mass
H.8-solar-mass
I.7-solar-mass
J.)
K.
Student
L.
Student
M.Algol
N.
O.Electric
P.Magnetic
Q.Gravitational
R.Nuclear

A.acetic
B.HCl；
C.NaOH；
D.NaOH；

A.30
B.less
C.80
D.
B.between
E.80
F.30
G.
C.between
H.30
I.80
J.
D.greater
K.80
L.