Answer:
C). Use I before e except after c.
Step-by-step explanation:
As per the question, the thumb rule of mnemonics that 'I before e, except after c must be used' would be employed to rectify the given sentence. According to this rule, the words involving the digraphs either 'ie' or 'ei' must employ 'i' first and 'e' later excluding the case where the preceding letter is 'C.' Thus, the word 'inconveneint' would be converted to 'inconvenient'('ei' to 'ie') as per this rule in order to make its spelling grammatically correct. Hence, option C is the correct answer.