Which of the following compounds would undergo Cannizzaro's reaction?

Which of the following carbonyl compounds forms the most stable hydrate when $H_2O$ is added across the $C=O$ group?

The above conversion can be carried out by,

$C_6H_5-CH=CHCHO \xrightarrow{X} C_6H_5-CH=CHCH_2OH$. In the above sequence,$X$ can be:

$Ph_2CH-C(=O)H \xrightarrow{\text{aqueous acid}} (A) (81\%) + \text{enol} (2\%) + \text{aldehyde} (17\%)$. Product $(A)$ of the above reaction will be:

Which of the following compounds does not give a positive Fehling's test?