What is the function of vitamin B1 in the body?

A- It participates in the oxidation of most substrates, such as carbohydrates, lipids, and proteins.
B- It is a coenzyme that intervenes in the decarboxylation of ketoacids, such as pyruvate or alpha-ketoglutarate.
C- It is a coenzyme that participates in the transfer of hydrogen and electrons in oxidation-reduction processes.
D- It is a coenzyme that intervenes in the process of transamination, transferring the amino group of amino acids to a ketoacid.
a) Only A and B are correct.
b) Only B and C are correct.
c) Only A, B, and C are correct.
d) Only B and D are correct.
e) All statements are correct.