Which of the following statements is correct?

What is the correct order of events occurring in blood clotting?
$I.$ Conversion of fibrinogen to fibrin
$II.$ Formation of clot
$III.$ Thromboplastin formation
$IV.$ Conversion of prothrombin to thrombin
Choose the correct option.

Match the following:
Disease: Cause
$A.$ Diabetes: $6.$ Increase in blood sugar level
$B.$ Uraemia: $7.$ Urea is in excess in blood
$C.$ Anaemia: $5.$ Fall in $RBC$ count
$D.$ Polycythemia: $3.$ Rise in $RBC$ count
$E.$ Pernicious or Megaloblastic anaemia: $2.$ Deficiency of vitamin ${B_{12}}$
$F.$ Leukemia: $8.$ Pathological increase in $WBC$
$G.$ Thrombocytopenia: $9.$ Decrease in the number of platelets
$H.$ Leucopenia: $4.$ Fall of $WBC$ count
$I.$ Leucocytosis: $1.$ Rise in $WBC$ count
The correct matching sequence is:

Which of the following statements are wrong?
$(i)$ Leucocytes disintegrate in the spleen and liver.
$(ii)$ $RBC$,$WBC$ and blood platelets are produced by bone marrow.
$(iii)$ Neutrophils bring about destruction and detoxification of toxins of protein origin.
$(iv)$ The important function of lymphocytes is to produce antibodies.

The $.....$ is the blood bank of the body.

Assertion $A$: In an open circulatory system, the blood volume is high, but the blood pressure is low and irregular.
Reason $R$: In a closed circulatory system, the blood volume is limited, and the blood pressure is high and regular.
Which option is correct for Assertion $A$ and Reason $R$?