- Prepositions are words that define the time, location, direction, and relation between two or more elements.
- In this sentence, 'wanting' means lacking in something.
- In such a case, the word 'wanting' is followed by the preposition 'in.'
- We get the answer from the phrase 'lacking in.'
- If we replace the word 'lacking' with 'wanting' we get the preposition 'in.'