Identify the segment in the sentence which contains the grammatical error.

The Company invests in emerging (a)/ markets which tends to be more volatile (b)/ than mature markets and the value of your investment could move sharply up or down. (c)/ no error (d)

a) The Company invests in
b) markets which tends to be more volatile
c) than mature markets and the value of your investment could move sharply up or down.
d) No error