Read the sentences given below and identify the one that contains a grammatical or contextual error. If all the sentences are grammatically and contextually correct, select the "all are correct" option.

The correct option containing a grammatical/contextual error is:
"Children are innocent, they are curious, they are growing and the one quality that shines within them is their courageousness — but they must never be pushed to suppress it."

Explanation:
1. Word Choice Error: The sentence uses the awkward and non-standard noun "courageousness" instead of the correct, standard noun "courage".
2. Punctuation / Comma Splice: The initial part of the sentence ("Children are innocent, they are curious, they are growing...") joins multiple independent clauses with simple commas without proper coordinating conjunctions or semi-colons, leading to a comma splice error.

All other given options are grammatically and contextually correct.