The correct answer is: A. was discussed
The verb “discuss” is used to talk about talking about something. It is typically used in the past tense, as in “We discussed the problem at the last meeting.” This is because discussions typically take place at a specific time and then end.
The verb “has been discussed” is also used to talk about talking about something, but it is typically used in the present perfect tense, as in “The problem has been discussed at several meetings.” This is because discussions can take place over a period of time, and the speaker is not necessarily referring to a specific discussion.
The verb “discussed” is the simple past tense form of “discuss.” It is typically used to talk about a discussion that took place at a specific time in the past, as in “We discussed the problem yesterday.”
The verb “will be discussed” is the future tense form of “discuss.” It is typically used to talk about a discussion that will take place in the future, as in “The problem will be discussed at the next meeting.”
In this case, the most appropriate word to fill in the blank is “was discussed.” This is because the speaker is referring to a specific discussion that took place at the last meeting.