Concept:
People often adopt beliefs or opinions because many others around them support those beliefs.
Step 1:
Rajan initially had no strong opinion about capital punishment.
Step 2:
After noticing that many public figures and people supported capital punishment, he also started supporting it strongly.
Step 3:
The bandwagon effect occurs when individuals adopt beliefs, trends, or opinions because many others already support them.
Step 4:
• Social compliance refers to obeying social pressure temporarily.
• Internalization involves deeply accepting beliefs as personal values.
• Social identification means adopting behaviour to maintain group membership.
Step 5:
Therefore, the correct answer is Bandwagon effect.
\[
\boxed{\text{(1) Bandwagon effect}}
\]