Based on "MLA In$-$Text Citations" and "Additional Punctuation Rules When Using Quotation Marks," which one of the following is the correct citation for an Internet source from a web page?

a$.$

"Faith is the first factor in a life devoted to service. Without it$,$ nothing is possible. With it$,$ nothing is impossible." $$ Mary McLeod Bethune. This means that faith is a key to victory in life. She emphasizes faith as a key to victory in life.

b$.$

As Mary McLeod Bethune has said, $"$ Faith is the first factor in a life devoted to service. Without it$,$ nothing is possible. With it$,$ nothing is impossible". She emphasizes faith as a key to victory in life.

c$.$

As Mary McLeod Bethune has said, $"$ Faith is the first factor in a life devoted to service. Without it$,$ nothing is possible. With it$,$ nothing is impossible." She emphasizes faith as a key to victory in life.

d$.$

Faith is the first factor in a life devoted to service. Without it$,$ nothing is possible. With it$,$ nothing is impossible." $$ Mary McLeod Bethune. This means that faith is a key to victory in life. She emphasizes faith as a key to victory in life.