What is the product formed when benzene diazonium chloride reacts with phenol in a weakly basic medium?

The correct order of basicities of the following compounds is:
$1. CH_3-C(=NH)NH_2$ (Acetamidine)
$2. (CH_3)_2NH$ (Dimethylamine)
$3. CH_3-CH_2-NH_2$ (Ethylamine)
$4. CH_3-CONH_2$ (Acetamide)

Methyl isocyanide on hydrolysis gives

Reduction of nitrobenzene with $Zn$ and alcoholic $KOH$ solution results in the formation of the following compound:

$C_6H_5NH_2$ $\xrightarrow[0-5\,^{\circ}C]{HCl + NaNO_2} A$ $\xrightarrow{CuCN} B$ $\xrightarrow{H_2/Ni} C$ $\xrightarrow{HNO_2} D$
The structure of $D$ is

The order of basicity of ethyl amines in an aqueous solution is: