Which of the Following Best Describes the Formation of a Hemiacetal

Which of the following best describes the formation of a hemiacetal?

A) The presence of an acid speeds up the rate of formation on a hemiacetal,whereas the presence of a base has no influence in the rate of formation of a hemiacetal.
B) The presence of an acid has no influence in the rate of formation on a hemiacetal,whereas the presence of a base speeds up the rate of formation of a hemiacetal.
C) Both the presence of an acid and a base speed up the rate of formation on a hemiacetal.
D) The presence of either an acid or a base have no influence in the rate of formation of a hemiacetal.