Select the option that has an error in the use of present tense.
A.The mother cooks delicious food for her children.
B.I have performed all my duties with utmost sincerity.
C.I am observing your mischievous activities for half an hour.✓ Correct
D.The painter is painting the wall right now.
Explanation
When referring to an action that has been ongoing for a duration (like 'for half an hour'), the present perfect continuous tense should be used. The correct sentence would be 'I have been observing your mischievous activities for half an hour.'
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