When an atom, ion, or molecule of a reactant switches places with an unpaired reactant, the type of reaction is called

a. decomposition reaction
b. double replacement reaction
c. single replacement reaction
d. synthesis reaction

D. Synthesis Reaction is your answer for this

It is one of the lateral ligaments of the ankle and prevents the foot from sliding forward in relation to the shin. ... It is the most commonly injured ligament in a sprained ankle—from an inversion injury—and will allow a positive anterior drawer test of the ankle if completely torn.