Parts C and D have errors. In both parts, the prepositions 'on' and 'at' are incorrect. Instead, the prepositions 'at' (expressing the means by which something is done) and 'of' (expressing the relationship between a part and a whole) can be used respectively.
The correct sentence is: Institutionalised patients with a psychiatric condition can become normal at the end of the therapy.
Hence, the correct answer is option (c).
Note:
A Preposition is a word placed before a noun or a pronoun or a noun equivalent (pronoun, adverb, gerund, infinitive, adverbial clause, or any clause that can be used as the object of the preposition) and shows a relationship in space or time or a logical relationship between two or more people, places, or things in a sentence.
Examples
I. The teacher scolded the child for being late.
II. We're going to a party.
· The words in bold are called prepositions because they normally take position before (pre) a noun/pronoun or a noun equivalent (pronoun, adverb, gerund, infinitive, adverbial clause, or any clause that can be used as the object of the preposition.
· The noun/pronoun which is used with a preposition is called its Object.
Study Notes
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