Which One of the Following Reactions Will Occur Spontaneously at Standard-State

Which one of the following reactions will occur spontaneously at standard-state conditions and 25 ^$\circ$ C

A) Mg²⁺ + Ca $\rarr$ Mg + Ca²⁺
B) Au + 3K⁺ $\rarr$ Au³⁺ + 3K
C) 2Al³⁺ + 3Fe $\rarr$ 2Al + 3Fe²⁺
D) Cu + 2H⁺ $\rarr$ Cu²⁺ + H₂
E) Ni²⁺ + 2Fe²⁺(aq) $\rarr$ Ni(s) + 2Fe³⁺(aq)