Meanings of obvious possibilities in English

Pneumonia, diphtheria, scarlatina and measles-allthese were among the more obvious possibilities.

As though he had not canvassed such obvious possibilities as these!

The research was original, groundbreaking and had obvious possibilities.

Once he was through with the obvious possibilities, he'd need to start culling through messages by hand.

Fishing flies with a medical connection were obvious possibilities, although to call my place General Practitioner Cottage could have bordered on advertising.