Does Cuvette Size Affect Absorbance?

The absorbance is directly proportional to the length of the light path (l), which is equal to the width of the cuvette.

Can cuvette affect absorbance?

A cuvette (with fingerprints on it) will give a slightly higher absorbance reading and the measured concentration will be significantly higher than the actual concentration. Hence the required answer is- (B)Concentration would be higher since more light is being reflected or absorbed, increasing the absorbance reading.

How would the absorbance data be different if you used cuvettes that were twice the width?

Yes, doubling the width of the cuvette - keeping everything else constant - would double the absorbance you would measure.