Read the following sentence carefully and check each part for error. Mark the option that indicates the error.
I helped everyone of those girls in doing their home task.

Correct option is A

The error lies in option (a).

• Explanation: The phrase “I helped everyone” is incorrect in this sentence because the expression should be “every one” when it refers to each individual member of a group. The sentence intends to mean that help was given to each girl separately, so everyone should be written as every one.
• Correct sentence: I helped every one of those girls in doing their home task.
• Grammatical rule (English): Everyone is an indefinite pronoun meaning everybody. Every one of is used when referring to each member of a particular group.
• व्याकरण नियम (Hindi): Everyone का अर्थ होता है “हर व्यक्ति” जबकि every one of का प्रयोग किसी विशेष समूह के प्रत्येक सदस्य के लिए किया जाता है।

So the correct answer is (a)