Choose the best option that complete the sentence. in the last...

Choose the best option that complete the sentence.
in the last hundred years, traveling ( much easier and very comfortable. in the 19th century, it (take) two or three months to cross north america by covered wagon. the trip (be) very rough and often dangerous. things (change) a great deal in the last hundred and fifty years. now you can fly from new york to los angeles in a matter of hours.
a) became – took – was – has changed
b) has became – has taken – has changed
c) become – take – change
d) has become – has taken – has changed
e) has become – has took – changed