The bacterium $Methylophilus$ $methylotrophus$,due to its high rate of biomass production and growth,is capable of producing $25$ tonnes of protein.

$A$: Proteins produced by microorganisms are known as Single Cell Proteins $(SCP)$.
$R$: The production of Single Cell Proteins causes environmental pollution.

Consider the following four statements $(1-4)$ and select the option that includes all the correct statements:
$(1)$ The unicellular $Spirulina$ can produce large quantities of food rich in protein,minerals,vitamins,etc.
$(2)$ $Methylophilus$ $methylotrophus$,because of its high rate of biomass production and growth,can produce $25$ tonnes of protein per day.
$(3)$ Common button mushrooms are rich in Vitamin $C$.
$(4)$ Rice varieties have been developed which are rich in calcium.

The advantages of single cell proteins are:
$I$. Easy to grow
$II$. Nutrient rich
$III$. High yield
Choose the correct option.

Single Cell Protein $(SCP)$ is obtained through which process?

What does Single Cell Protein $(SCP)$ help to reduce?