Hi j_shreyans,

The correct idiomatic expression is "credited with" when we want to say that someone has achieved something. Example: "Brent is credited with inventing Calculus."

"Credited to" is used when we want to recognize the source or inspiration of someone's achievement. Example: "Brent credited his invention of Calculus to his baby boy, who inspired him to work hard and think big thoughts."

The other answers ("credited as" and "credited for") are idiomatically incorrect given the intended meaning of the sentence.

I hope this helps.