In cockroach,which of the following is the principal motor centre?

The figure given below shows the reproductive system of a female cockroach. The correct labellings indicated by alphabets $(A, B, C)$ are respectively:

Identify the odd one out.

Which of the following statement$(s)$ is/are correct regarding the digestive system of cockroach?
$(i)$ Mouth opens into a short tubular pharynx,leading to a narrow tubular passage called oesophagus.
$(ii)$ Gizzard helps in grinding the food particles.
$(iii)$ $A$ ring of $6-8$ blind tubules called hepatic or gastric caecae is present at the junction of foregut and midgut,which secrete digestive juice.
$(iv)$ At the junction of midgut and hindgut is present another ring of $100-150$ yellow coloured thin filamentous Malpighian tubules which help in removal of excretory products from haemolymph.

Match the following columns regarding the reproductive system of a cockroach:

Column-$I$	Column-$II$
$P$. Testes	$I$. $2$nd to $6$th segments
$Q$. Mushroom gland	$II$. $6$th to $7$th segments
$R$. Ovaries	$III$. $6$th segment
$S$. Seminal vesicles	$IV$. $4$th to $6$th segments

Match the column-$I$ with column-$II$ and select the correct option (in cockroach):-

Column-$I$	Column-$II$
$A$. Mushroom gland	$P$. $6^{th}$ segment
$B$. Testis	$Q$. $2^{nd}-6^{th}$ segments
$C$. Spermatheca	$R$. $4^{th}-6^{th}$ segments
$D$. Ovaries	$S$. $6^{th}-7^{th}$ segments