(B) 'Augur' is an occasion or omen; 'auger' is a tool bit. The keyword is 'carpentry' (B) 'Cannon' is a big gun; 'canon' is a principle. The keyword is 'propriety' (A) 'Prognosis' is to find the way ahead (projection). 'Diagnosis' is to find out what and why (identification); 'why' is already known in context. (B) 'Splutter' is to hiss or stutter. 'Splatter' is to splash; the keyword is 'ink'.