What is obtained from yeast?

Which option shows the correctly matched pairs from the table below?

Column-$I$	Column-$II$
$1$. Trichoderma polysporum	$(A)$. Butyric acid
$2$. Monascus purpureus	$(B)$. Cyclosporin $A$
$3$. Clostridium butyricum	$(C)$. Citric acid
$4$. Aspergillus niger	$(D)$. Statins

$A$: Fermentation stops when the alcohol concentration in a sugar solution reaches about $13 \%$.
$R$: $Saccharomyces \ cerevisiae$ are killed by the high concentration of alcohol,and zymase activity is inhibited.

What concentration of alcohol becomes toxic to yeast and causes its death?

Identify the microbial source for the antibiotic streptomycin.

Roquefort cheese is ripened by growing a specific organism on it. Identify the organism.