Concept:
In Indian philosophy and Vedic literature, Shruti refers to sacred knowledge that was “heard” by ancient sages directly from divine revelation.
• Shruti means “that which is heard”.
• Includes the Vedas.
• Considered divine knowledge.
Step 1: Understand the literal meaning.
The Sanskrit root:
\[
\text{Shru} = \text{to hear}
\]
So:
\[
\text{Shruti} = \text{that which is heard}
\]
Step 2: Relate to Vedic tradition.
Ancient sages received Vedic knowledge by:
Divine hearing or revelation
Hence it is called Shruti.
Step 3: Eliminate incorrect options.
• Dharma -- duty/righteousness
• Yajur -- a Veda
• Sama -- a Veda
• Shruti -- correct
Step 4: Final conclusion.
Hence, the correct answer is:
\[
\boxed{\text{Shruti}}
\]