Question

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Explanation:

1. The two clauses ("The venerable old elm tree had sheltered and shaded two generations of our family" and "it was starting to decay and had to be cut down") are independent clauses (complete sentences) that show a contrast.
2. When using a conjunctive adverb like "nevertheless" or "however" to connect two independent clauses, a semicolon must come before the conjunctive adverb, followed by a comma.
3. "Nonetheless" follows the same punctuation rule as "nevertheless", but the option using it incorrectly uses a comma instead of a semicolon before the word. The "however" option also uses incorrect punctuation (no semicolon before the word). Only the first option uses the correct semicolon + conjunctive adverb + comma structure to link the contrasting independent clauses.

Answer:

family; nevertheless,