In option (a), the plural objective pronoun 'them' is incorrectly used to denote the singular noun 'ball'. Instead, the singular form 'it' is to be used.
In option (c), the possessive adjective/determiner 'their' is incorrectly used instead of the adverb 'there'.
In option (d), the plural noun 'concerns' incorrectly follows the singular determiner/article 'a'. Instead, the singular form of the noun 'concern' or 'many concerns' is to be used.
Option (b), is the sentence that is grammatically and contextually correct without any errors.
Hence, the correct answer is option (b).
Note:
Possessive Determiners/Adjectives: Words like 'my', 'our', 'your', 'his', 'her', 'its', and 'their' are known as possessive adjectives (or possessive determiners). They come before nouns and indicate ownership of the noun. Example: "The teacher asked the students to open their drawing books."
Objective Pronouns: The pronouns me, you, us, him, her, it, and them are called objective pronouns because they act as the objects of verbs and prepositions: Anjali drove us home.
Determiner: A modifying word that determines the kind of reference a noun or noun group has, for example, 'a', 'the', 'every', 'much', 'many', etc.
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