Answer:
The function of the underlined noun phrase is the direct object.
Step-by-step explanation:
In the sentence "Now that I am a vegetarian, I try whichever recipes feature beans and fresh vegetables" the phrase "whichever recipes" represents the direct object that is being affected by the action of the verb "try" were "I" is the subject and the active part of the complete sentence. The other options refer to different parts of the speech.