which one below is a phrasal prepositional verb?

The correct answer is: do away with

phrasal prepositional verb বোঝার জন্য আমরা Prepositional Phrase, Prepositional verb এবং phrasal verbs কে পাশাপাশি রেখে বোঝার চেষ্টা করব:

Prepositional Phrase
A prepositional phrase consists of a preposition followed by its object (usually a noun phrase).
Example: A singer with passion.

Prepositional phrases function as either adjective modifying nouns or adverbs modifying verbs.
- As an adjective: I know the policeman with the radio.
- As an adverb: Lee lives in that fridge. (These types of prepositional phrases are adverbial prepositions)

অন্য দিকে,
Prepositional verb এবং Phrasal verb ও দুটি আলাদা বিষয়। যেমন:

- Passed away= (Cease to live) She passed away from cancer" , it's a phrasal verb not a preposition. (এখানে শব্দের আভিধানিক অর্থ পরিবর্তিত হয়ে, সম্পূর্ণ নতুন একটি অর্থ প্রদান করছে।
- looking at = (Focus on as an example) She is looking at the white board= Its a prepositional verb. (এখানে শব্দের মৌলিক অর্থ পরিবর্তিত হয় নি)

On the other hand,

Phrasal prepositional verb:
- It is the verb and the first element, a particle, constitutes a phrasal verb, which is followed by a preposition.
Typical examples of phrasal prepositional verbs include:
Do away with , Look up to , Run up against , Looking forward to.

Source: Oxford Practice Grammar by J. Eastwood & Cambridge Dictionary Grammar reference