The correct answer is (D) To honor (someone or something); to celebrate (in speech or writing); to preserve in memory by celebration; to recall to memory; to make honorable mention of. Also, to serve as a memorial, memento, or reminder of.

Commemorate comes from Latin commemorare.

Examples of use:

• Christians commemorate the crucifixion of Christ on Good Friday.
• This monument commemorates those who died during the World Wars.