Concept:
Absolute poverty refers to a condition in which an individual or household is unable to meet the minimum basic needs required for survival, such as food, clothing, shelter, healthcare and education. It is measured using a fixed minimum standard known as the poverty line.
The poverty line represents the minimum income or expenditure required to satisfy essential consumption needs.
Step 1: Examine Assertion (A).
The assertion states that absolute poverty refers to a minimum subsistence level below which no family should live.
This is correct because absolute poverty measures whether people possess sufficient resources to satisfy their basic necessities of life.
Hence,
\[
\boxed{\text{Assertion (A) is Correct.}}
\]
Step 2: Examine Reason (R).
Governments generally estimate absolute poverty by fixing a poverty line, which represents the minimum income or consumption expenditure required to meet essential needs.
Individuals or families whose income or expenditure falls below this poverty line are classified as poor.
Therefore,
\[
\boxed{\text{Reason (R) is Correct.}}
\]
Step 3: Determine whether (R) correctly explains (A).
The reason explains how absolute poverty is measured.
Since the poverty line represents the minimum consumption requirement needed for subsistence, it directly explains the concept stated in the Assertion.
Therefore,
\[
\boxed{
\text{Reason (R) correctly explains Assertion (A).}
}
\]
Hence,
\[
\boxed{\text{Correct Answer}=(A)}
\]