60. Which of the following statements is correct?

(A) A condition always refers to the future.

(B) The debtor loses the right to the period if he does not give any security to the creditor.

(C) The condition not to do an impossible thing does not render the obligation void.

(D) In alternative obligations, the right to select which of the prestations shall be delivered belongs to the creditor, unless expressly given to the debtor.