In the scientific name of organisms,which taxonomic category is written in lowercase letters?

Which of the following is not a genus?

As we go higher from species to kingdom,the number of common characters?

The taxonomic category that consists of organisms with maximum similarity and the ability to interbreed to produce fertile offspring is .........

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

Assertion $(S)$: Kingdom is the largest taxonomic category.
Reason $(R)$: The major group that includes all other groups is called a Kingdom.
$(a)$ Both $S$ and $R$ are true,and $R$ is the correct explanation of $S$.
$(b)$ Both $S$ and $R$ are true,but $R$ is not the correct explanation of $S$.
$(c)$ $S$ is true and $R$ is false.
$(d)$ $S$ is false and $R$ is true.
$(e)$ Both $S$ and $R$ are false.