Answer:
the first one
The children will get a special treat, such as an apple, from the dentist.
Step-by-step explanation:
since
Paul making sure to book the flight early, carefully kept track, of his traveling itinerary.
should be:
Paul, making sure to book the flight early, carefully kept track of his traveling itinerary.
due to the misuse of comma and comma splicing. also for the format, most words are in the wrong tense or could use an 'and' to replace a comma.
The rotary club which meets every third Thursday, assembles in the town hall.
this sentence should be
The rotary club which meets every third Thursday assembles in the town hall.
because there is no need to use a comma.
then...
The hen gathering her chicks together, guided them into the coop, before the storm hit.
there are many errors in this one such as the wrong tense for the format, over usage of commas, and missing 'and's
The hen gathered her chicks together and guided them into the coop before the storm hit.
this sentence has no actual need for commas.
therefore that leaves us with our only usable option left. the first one.
the correct way to use two commas is to add in something that could be side knowledge or could be put in parenthesis such as:
My dog, Marty, is turning 6 today.
it doesn't have to be included in the sentence because
My dog is turning 6 today.
is a full sentence, but it gives the sentence more context, structure, or background.
hope this helps:)