Transform the below sentence by replacing the word-"if" with the most appropriate word:
If I were rich, I would have bought an expensive perfume for you.
Option A: The auxiliary verb, 'had' can be used to replace the word' if' in a conditional sentence in the past tense. The given sentence is in the past tense. Hence, 'had' can be used. 'Had' is used along with the past participle form of the main verb. The main verb in the given sentence is 'were' which is the past tense of the verb, 'be'. The clause, 'If I were rich' can be replaced by 'Had I been rich'. Hence, this option is incorrect.
Option C: A conditional sentence can begin with the auxiliary, 'were' provided the original sentence (starting with 'If') has 'were' as the linking verb. (The linking verb acts as the main verb). In the given sentence, 'were' is the linking verb. The appropriate form of using 'were' is: 'Were I rich'. The use of the past participle (the word 'been') in the sentence is grammatically incorrect. Hence, this option is incorrect.