Eating fresh fruits and vegetables is beneficial to one's health while eating processed foods is …

Analyze the question The underlined word is "beneficial" (the sentence contrasts eating fresh fruits and vegetables with eating processed foods). We need a word that:

1. Is opposite in meaning to "beneficial", and
2. Fits the gap logically and grammatically.

Explain the concept This is an antonym question with a sentence context. "Beneficial" means helpful, good for, or advantageous. Its opposite will mean causing damage or ill effect. The word "while" signals contrast, so the gap needs the opposite idea of "good for one's health."

Test each option

• A. worrying means causing anxiety. It is not the opposite of beneficial, because something can be worrying without being the reverse of helpful.
• B. painful means causing physical hurt. Processed foods are not generally described as painful, and it is not the direct opposite of beneficial.
• C. tasteless means lacking flavour. It has nothing to do with health benefit.
• D. harmful means causing damage or injury. It is the direct opposite of beneficial, and it fits the sentence: "...while eating processed foods is harmful."

Answer The correct option is D. harmful.

Tip In antonym-in-context questions, first find the contrast signal (while, but, however, whereas). Then pick the word that reverses the key idea. Here "beneficial to health" becomes "harmful to health." Also check that the word fits the sentence grammatically, not just in meaning.