A cloudy suspension of cells can have a lower osmolarity than a clear solution because osmolarity counts:

1. Cloudiness comes from whole cells scattering light, which says nothing about dissolved solute. 2. Osmolarity depends on the number of dissolved particles. 3. A solution that is cloudy with cells may have a lower osmolarity than one that is clear, if the second contains more dissolved molecules than there are cells. 4. So appearance is not a guide, and options A, C and D each count the wrong thing. _Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 5 'Structure and Function of Plasma Membranes', sections 5.1-5.4_