Why do you entitle this question "choose," and then never employ "choose" in your OP? Choose makes sense, but opt does not. Once again, that sentence does not appear to have been written by a native speaker of English.
Thu 8 Oct, 2015 03:49 pm
According to my experience, you opt FOR things. FOR usually cannot be omitted. But I don't know when there are unusual situations.
To, for, in, out...all are necessary and cannot be omitted.