Final answer:
Magnesium and zinc are the two most reactive metals based on their rapid and vigorous reactions with acid, which align with the activity series of metals.
Step-by-step explanation:
The two most reactive metals, based on the given data, are magnesium and zinc. This is indicated by the observations that magnesium and zinc both reacted vigorously with acid, producing a rapid evolution of hydrogen gas. The initial reaction with magnesium was noted to be more vigorous than that with zinc, which aligns with the general understanding of the reactivity series of metals, where magnesium is known to have a greater tendency to be oxidized than zinc. According to the activity series, metals at the top, like alkaline earth metals (which include magnesium), and alkali metals have the greatest tendency to lose electrons and are thus more reactive compared to other metals such as iron, copper, or silver, which are lower in the series and less reactive.