Concept:
Sarva Shiksha Abhiyan (SSA) is the Government of India's flagship programme launched to achieve Universal Elementary Education by ensuring that every child receives free and compulsory education.
• Launched in 2001.
• Covers children aged 6--14 years.
• Supports the implementation of the Right to Education (RTE).
Step 1: Understand the objective of SSA.
The primary objective of Sarva Shiksha Abhiyan is:
\[
\boxed{\text{Universal Elementary Education}}
\]
This means ensuring that every child has access to quality elementary education.
Step 2: Identify the major goals of SSA.
The programme aims to:
• Enrol all children in schools.
• Reduce school dropouts.
• Improve the quality of elementary education.
• Promote social and gender equality in education.
Step 3: Compare the options.
• Universal elementary education -- Correct.
• Secondary education reform -- Related to Rashtriya Madhyamik Shiksha Abhiyan (RMSA).
• Adult education -- Different programme.
• Promotes only girls' education -- SSA promotes education for all children.
Step 4: Final conclusion.
Hence, the main aim of Sarva Shiksha Abhiyan is:
\[
\boxed{\text{Universal elementary education}}
\]