Question

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choose the sentence with correct comma usage.
my dear old grandfather, who is seventy years old, still jogs everyday.
my dear old grandfather who is seventy years old still jogs everyday.
my dear old grandfather, who is seventy years old still jogs everyday.

Explanation:

To determine correct comma usage, we analyze the non - restrictive clause "who is seventy years old". A non - restrictive clause, which provides extra information about the noun it modifies (here, "grandfather"), should be set off by commas.

• In the first option, the comma before "who" is incorrect as it's not needed there.
• The second option lacks commas around the non - restrictive clause, so it's wrong.
• The third option correctly places commas around the non - restrictive clause "who is seventy years old" to separate the extra information from the main clause "My dear old grandfather still jogs everyday".

Answer:

Third option: My dear old grandfather, who is seventy years old, still jogs everyday.