PEMS Pedro Dela Cruz and Maria Makiling got married on 2017. After their marriage Pedro confessed that he killed Juan Tamad, Maria's ex-boyfriend by using his service firearm. On February 2021, the NBI found evidence linking Pedro's service firearm and the bullets that were found in Juan's body. The NBI interviewed Maria and found out that Pedro confessed to Maria about the killing of Juan.

a. Pedro was charged with homicide and the public prosecutor will be presenting Maria as their witness to testify on the extra-judicial confession of Pedro, what are the objections available for Pedro to prevent the testimony of Maria Makiling? Why? (Cite your legal basis)

b. What if Pedro told Maria that he killed Juan while Maria was still Pedro's fianc, would the circumstance affect your answer in question 1 (a)? Why?

c. What if Pedro and Maria had separated and an annulment was granted by the court on October 2020, would the different circumstance affect you answer in question 1 (a)? why?