Which sentence is correctly punctuated?

a. i knew i won the award, because my brother works in the sports office and he called me with
the news.
b. i knew i won the award because my brother works in the sports office and he called me with
the news.
c. i knew i won the award because my brother works in the sports office, and he called me with
the news.

answer: ok heres what i got on google

explanation: to recognize illness in frogs, toads, newts, or salamanders, look for the following signs:

inactivity or unusual behaviors. the first thing you might notice in your amphibian is abnormal behavior or appearance.

gradual or sudden weight loss.

body/abdominal bloat.

skin blotches.

eye cloudiness.

edema.

ian mortimer in his book "the time traveller's guide to elizabethan england" uses a narrative in his style, which successfully conveys a clear description of the life in england in the 16th century. he writes in second person, which makes it comfortable to reader and easy to understand, he captures the readers attention with views of the landscape, the streets, the people including rich and poor. he also depicts some cultural traits from how people behave, eat or what they wear. his descriptions range from the social, economical, the political power to the examples of the life of common people. it could be tell that this book is about social history rather than a   novel.