Rajeev is too . . . . . . . as far as his food habits are concerned.

The correct answer is B. fastidious.

Fascitious means excessively particular or demanding, especially about food or other small details. In this case, Rajeev is too particular about his food habits, which means he is fastidious.

The other options are not correct because:

• Enjoyable means causing or giving pleasure. This does not describe Rajeev’s food habits.
• Curious means eager to learn or know something. This does not describe Rajeev’s food habits.
• Involved means having a significant or important role in something. This does not describe Rajeev’s food habits.
• Interesting means arousing curiosity or interest. This does not describe Rajeev’s food habits.