Which chart provides the correct number of neutrons for each isotope of tin (sn)?

a.
isotope number of neutrons natural abundance (%)
120sn 33 32.58
118sn 24 24.22
116sn 14 14.54
119sn 9 8.59
124sn 6 5.79

b.
isotope number of neutrons natural abundance (%)
120sn 70 32.58
118sn 68 24.22
116sn 66 14.54
119sn 69 8.59
124sn 74 5.79

c.
isotope number of neutrons natural abundance (%)
120sn 50 32.58
118sn 50 24.22
116sn 50 14.54
119sn 50 8.59
124sn 50 5.79

d.
isotope number of neutrons natural abundance (%)
120sn 74 32.58
118sn 70 24.22
116sn 69 14.54
119sn 68 8.59
124sn 66 5.79

if you can, show your work or why you think it is the answer.