2. Last year, an earthworm from Wigan named Dave wriggled into the record books as the largest found in the UK. Dave was $40 \mathrm{~cm}$ long and had a mass of $26 \mathrm{~g}$.
What was Dave's mass per unit length?
A $0.6 \mathrm{~g} / \mathrm{cm}$
B $0.65 \mathrm{~g} / \mathrm{cm}$
C $0.75 \mathrm{~g} / \mathrm{cm}$
D $1.6 \mathrm{~g} / \mathrm{cm}$
E $1.75 \mathrm{~g} / \mathrm{cm}$