Which of the following is essential to avoid environmental pollution?

Select the correct statement.

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$ :
Assertion $(A)$ : $Spirulina$ is a microbe that can be used for reducing environmental pollution.
Reason $(R)$ : $Spirulina$ is a rich source of protein,carbohydrates,fats,minerals and vitamins.
In the light of the above statements,choose the most appropriate answer from the options given below:

Match the columns:

Column-$I$	Column-$II$
$(a)$ Ladybird	$(1)$ Methanobacterium
$(b)$ Mycorrhiza	$(2)$ Trichoderma
$(c)$ Biocontrol	$(3)$ Aphids
$(d)$ Biogas	$(4)$ Glomus

$Assertion (S)$: Ernest Chain and Howard Florey were awarded the Nobel Prize in $1948$.
$Reason (R)$: Lactic acid is produced by the fungus $Aspergillus$ $niger$.

Which of the following is an incorrectly matched pair?