Each vs both

The following sentence is from New Hello, Third Secondary, Egypt.

My parents ….. have a mobile phone.
a) all       b) each       c) every       d) both

The model answer is both, but I wonder if 'each' is also a possible answer. However, is it necessary to use commas if 'each' is another possible answer, i.e My parents, each, have a mobile phone?

Thanks for anyone who can help me out!

 

Original Post
×
×
×
×