Which demonstrates better resolution?

Which demonstrates better resolution?

A) Measuring two yeast cells as individually having a diameter of 10um

B) Measuring two bacteria arranged end to end as individually having a length of 2um

C) Observing a clump of algae 0.5mm by 0.75mm

D) Measuring a flea as 1.2mm at the longest point

E) Observing two adjacent bacteria as individually having a width of 0.3um.