Answer:
The second missed out full stop at end.
The third answer is wrong as however is in lower case.
The fourth is as well as wrong the however is in lower case.
The last missed out full stop.
So, the first is correct as however dont really nessasarily need comma.
During the postwar era c) former English colonies were breaking free and beginning to use the language in different ways around the world. This happened mostly during the 1960's and is now still an extremely popular language, due to globalization, as many jobs require it to be spoken whether you are living in an anglophone country or not.