The following sentences are given. Some of them may contain grammatical errors. Identify the sentence(s) with grammatical mistakes. If all sentences are correct, select "All are correct".
(A) Despite of facing challenges, she persevered and achieved success in her chosen field.
(B) The scientific community continues to explore innovative solutions to address environmental issues.
(C) Learning a new language can be both challenging or rewarding, requiring consistent practice and dedication.
(D) The novel's intricate plot kept readers engaged from beginning to end.

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**Solution:**

1. Sentence (A): The phrase "Despite of" is incorrect. The correct form is "Despite" without "of". So, (A) contains a grammatical error.

2. Sentence (B): This sentence is grammatically correct. It clearly states that the scientific community is exploring solutions.

3. Sentence (C): The phrase "both challenging or rewarding" is incorrect. The correct conjunction to use with "both" is "and", so it should be "both challenging and rewarding".

4. Sentence (D): This sentence is grammatically correct and well-structured.

Hence, only sentences (A) and (C) have grammatical errors.

**Answer:** (c) Only (A) and (C)

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