Concept:
Political parties in India are broadly classified into two categories:
National Parties and
Regional (State) Parties. National parties operate across many states and have a nationwide presence, whereas regional parties mainly operate within a particular state or region.
Step 1: {\color{red}Identify the type of parties in each option.}
- Bharatiya Janata Party (BJP) and Aam Aadmi Party (AAP) are recognised as national parties.
- Bharatiya National Lok Dal and Jananayak Janata Party are regional parties mainly active in Haryana.
- National People’s Party and United Democratic Party are regional parties active in northeastern states.
- Rashtriya Janata Dal and Loktantrik Samajwadi Party are also regional parties.
Step 2: {\color{red}Find the odd pair.}
Options (B), (C), and (D) contain regional political parties, whereas option (A) contains national parties.
Step 3: {\color{red}Select the odd one out.}
Therefore, the odd pair among the options is:
\[
Bharatiya Janata Party \& Aam Aadmi Party
\]
Hence, the correct answer is
Option (A).