Concept:
Paramel Praveshak Raga means a raga which helps in moving from one melodic group, mela or thaat environment to another.
Such ragas often act like connecting ragas between different musical zones.
Step 1: Understand the term Paramel Praveshak.
The word can be understood as:
\[
\text{Para} = \text{other}
\]
\[
\text{Mel} = \text{mela or thaat group}
\]
\[
\text{Praveshak} = \text{entering}
\]
So, Paramel Praveshak raga helps in entering another mela or thaat environment.
Step 2: Identify the correct raga.
Among the given options, Multani is regarded as a Paramel Praveshak raga.
It has a special position because of its swara structure and time placement.
Step 3: Compare the options.
Des, Jaunpuri and Bhimpalasi are important ragas, but they are not the expected answer here.
Multani is the correct Paramel Praveshak raga among the given choices.
Step 4: Final conclusion.
Therefore, the correct answer is:
\[
\boxed{\text{Multani}}
\]
Hence:
\[
\boxed{\text{(B)}}
\]