What change needs to be made to sentence 11 (reproduced below) to make the sentence grammatically
correct?
During this voyage, Fossett also kept in touch with weather forecasters, who helped him to avoid the harsh
conditions that had ended them.
O Change "this voyage" to "its voyage"
O Change "helped" to "help"
O Change "to avoid" to "in avoiding"
O Change "them" to "his previous flights"