Which sentence does not contain any errors in comma usage?

a.
everything turned out for the best, after all.

b.
in fact los angeles does have a public transportation system.

c.
people's houses generally speaking, have roofs.

d.
the dam moreover, was only three years old.

you can change by someone having a negative opinon of you in many ways for example thi can lead to depression and taking of ones life also known as sucide this effects there self esteem and ego in a negative way making them feel sad depressed and stressed causing them to act gloomy and sad if this continuses this can lead to self harm or much worse things.

hope i .

it is grammatically incorrect and is illegible to me and i can not answer it.