Dale Signs a Contract with Everbest Insurance Company That Intentionally

Dale signs a contract with Everbest Insurance Company that intentionally confers a benefit on Flo. Flo's rights under the contract will vest

A) automatically.
B) if she manifests assent to the contract or materially al?ters her po?si?tion in detrimental reliance on it.
C) only if she manifests assent.
D) only if she materially alters her position in detrimental reliance.