The table below lists the naturally occurring isotopes of element X. Calculate the average atomic mass.

Mass of isotope Relative abundance
15.33 amu 28.60%
17.26 amu 13.30%
18.11 amu 58.10%


A) 17.65 amu
B) 17.11 amu
C) 16.90 amu
D) 17.20 amu