Final answer:
The true statement about redox reactions is that electrons are transferred from the reducing agent to the oxidizing agent. Redox reactions involve electron transfer, and oxidation and reduction occur simultaneously in these processes.
Step-by-step explanation:
The statement that is true regarding redox reactions is d) Electrons are transferred from the reducing agent to the oxidizing agent. Redox reactions, short for oxidation-reduction reactions, involve the full or partial transfer of electrons from one reactant to another, characterizing these reactions as electron transfer processes. Oxidation is the loss of electrons, while reduction is the gain of electrons, and these two processes always occur simultaneously in redox reactions. It is important to note that oxidation does not necessarily involve the gain of oxygen nor does reduction always involve the loss of hydrogen. Additionally, redox reactions do not always involve oxygen; they can take place with or without it.