Single-Celled Paramecium Live in Pond Water (A Hypotonic Environment)

Single-celled Paramecium live in pond water (a hypotonic environment) .They have a structural feature,a contractile vacuole,which enables them to osmoregulate.If you observed them in the following solutions,at which sucrose concentration (in millimolars,mM) would you expect the contractile vacuole to be most active?

A) 0) 0 mM sucrose
B) 0) 05 mM saline
C) 0) 08 mM sucrose
D) 1) 0 mM sucrose
E) 1) 0 mM saline