Which of the following sentences is correctly punctuated? although, i was late getting to the office i still got all my work done. although i was late getting to the office i still got all my work done. although i was late getting to the office, i still got all my work done.

The girl walked up to the dog. of course she was only three years of age so she had no knowledge of what she was doing. she walked up to the wild beast, without considering the consequences. but she would find out soon. she held out her hand to touch the mangled canine. snap. the toddlers hand was soon covered in a red liquid.