Which sentence shows correct comma usage?
a) "oh no" he grumbled impatiently under his breath "now, i have to start all over."
b) "oh no" he grumbled impatiently under his breath "now i have to start, all over."
c) "oh no," he grumbled impatiently under his breath, "now i have to start all over."
d) "oh no," he grumbled, impatiently under his breath, "now i have to start all over."

C) "Oh no," he grumbled impatiently under his breath, "Now I have to start all over."

Explanation:

There are several instances where using a comma brings clarity and cohesiveness to your text. For example, a comma should be used when joining two independent clauses with a conjunction:

We could not make it in time, so we did not go.

A comma is also useful after an introductory phrase:

Forced to eat on her own, she decided to at least watch TV.

Commas should also be used when introducing direct quotes, such as in this example.

bildungsroman is a german word for novel covering youth to adulthood which describes a coming-of-age story

the answer:

in the first part of the story running is all that matters to squeaky. running gives her confidence and defines who she is. at the beginning of the story she says that other kids call her mercury because she runs very fast. in the text she refers to herself as "miss quicksilver".

the line that provides the best evidence that squeaky has self-confidence is

" and i continue with my breathing exercise, strolling down broadway toward the ice cream man on 145th with not a care in the world cause i am miss quicksilver herself".