Which taxonomic category covers the largest number of organisms?

Fill in the blanks $A$ and $B$ in the following taxonomic hierarchy:
Kingdom $\rightarrow$ Phylum $\rightarrow$ $[A]$ $\rightarrow$ Order $\rightarrow$ $[B]$

Match Column-$I$ with Column-$II$ and choose the correct option.

Column-$I$	Column-$II$
$A$. Family	$I$. $Ipomoea$
$B$. Kingdom	$II$. Polymoniales
$C$. Order	$III$. $Solanum$
$D$. Species	$IV$. Plantae
$E$. Genus	$V$. Solanaceae

Match the following organisms with their scientific names,orders,and families:

Common Name	Scientific Name	Order	Family
$a$. Earthworm	$p$. Rana tigrina	$w$. Glumiflorae	$1$. Poaceae
$b$. Sunflower	$q$. Zea mays	$x$. Anura	$2$. Asteraceae
$c$. Frog	$r$. Pheretima posthuma	$y$. Opisthopora	$3$. Megascolecidae
$d$. Maize	$s$. Helianthus annuus	$z$. Asterales	$4$. Ranidae

$A$ group of organisms with fundamental similarities is known as:

Three different genera $Solanum$,$Petunia$,and $Datura$ are placed in the family: