Which of the following is true of aldol reactions? O The thermodynamics and kinetics of aldol reactions can be controlled by base selection. O Aldol reactions can be completed by reacting an aldehyde and a ketone in the presence of a base O The yields of aldol reactions involving only one type of a hydrogen are generally higher than the yields of those involving multiple types of a hydrogens O Aldol reactions are used to create carbon-carbon bonds. O All of the above are true of aldol reactions.