Should I address this poor grade?

Hello!

So, basically they will encounter a grade 5 in sociology on my final grades. and in my school that would be like a D, but I was a straight A student, you will rarely find a B or a C in my high school report, I would like to address this poor grade + the whole sociology academic year, which started with a lack of a teacher throughout the second semester. (2019)

From August to December, my classmates and I would sit in class and wait for the teacher to arrive, after a while, we had given up, the school didn’t have enough qualified teachers for said subject.

Later on, a teacher was assigned (January, 2020), but since the pandemic started, they failed to give us any assignments through the google classroom app, and when questioned, they barely answered emails or messages. It was only on the second semester that we were given any content. I knew the lack of assignments during the first semester would affect my grades, which is why I made sure to put extra effort in the subject and have it delivered in time.

When my grades came out, the following characters appeared on my report:

1st quarter: -

2nd quarter: -

3rd quarter: 5

4th quarter: 8

I could not understand why there was a 5 on my 3rd quarter, like said before, I made sure to spend more hours studying the subject during that period, I was unable to go talk to a supervisor at school due to the pandemic, so I emailed and messaged the teacher through the google classroom app, as well as I emailed, called and messaged the school on social media, and yet, I have not received an answer.

At the end of the year, my report stayed the same, when my final grades came out, there was a 5 in sociology, which once again, I couldn’t understand, since the average between 5+8 would be a 6,5, I attempted on contacting the teacher again and failed.

I was thinking about using the “Do you wish to provide details of circumstances or qualifications not reflected in the application?“ space to explain this, what do you think?