22. Which of the following is true about the Witting reaction? (A) The formation of carbon-carbon double bond from carbonyl compounds (aldehydes and ketones) and triphenylphosphite is known as the Witting reaction. (B) The Horner-Wadsworth-Emmons reaction is a variation of the Witting reaction. The major is usually the (Z)-alkene isomer. (C) The Horner-Wadsworth-Emmons reaction involves use of a phosphonate ester instead of a triphenylphosphonium salt. (D) A cis oxaphosphetane intermediate is formed to produce a ( E )-alkene in the Wittig reaction. (E) All of these choices.