Grace and Sam are working together to see why their experimental value is different from the expected value. Sam says maybe we made a mistake in our measurements or calculations. Which of these are ways they can decide if Sam is right

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

it is b that is the answer.