Complete the sentence with a suitable option: Are you feeling doubtful _______ your decision?
A
about
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B
upon
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C
at
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D
for
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Solution
The correct option is A about The words 'your decision' which follows the blank is a noun phrase. Hence, in the phrase 'doubtful ______ your decision', the blank needs to be filled with the prepositions 'about' or 'of'. The common usage is 'doubtful about something', or 'doubtful of something'. Hence, option A is correct.
The phrases, 'doubt upon something', 'doubtful at something' and 'doubtful for something' are grammatically incorrect. Hence, options B, C and D are incorrect.