C is correct!
(A) The
growing demand for cheaper houses, unpolluted environs and tension- free lifestyle, along with the inability to pay the high rentals in down–town
have turned --> S/V agreement error
(B)The
growing demand for cheaper houses, unpolluted environs and tension- free lifestyle and for the inability to pay the high rentals in down–town
have turned --> S/V agreement error
(C) The
growing demand for cheaper houses, unpolluted environs, tension- free lifestyle together with the inability to pay the high rentals in down–town
has turned --> Correct!
(D)The
growing demands for cheaper houses, unpolluted environs and tension-free lifestyle in addition to the inability to pay the high rentals in down–town
is turning --> S/V agreement error
(E)The
growing demand for cheaper houses, unpolluted environs and tension- free lifestyles as well as the inability to pay the high rentals in down–town
are turning --> S/V agreement error