I am applying to master's courses in theoretical physics. I see that good grades, especially in foundational courses, are important when it comes to having a good application.
I have had good to great grades throughout except that I had a fallback in my Statistical Physics course during my exchange semester. My grade translates to a B in the American system but a C in the college I went to the exchange for.
I think I should address this drop in grades since Statistical Physics is an important course. Of course, I have learned the subject better since then and have made up for the disruption. I would like to mention that.
On the other hand, I do not have any real reason for the drop. I spent a good amount of time traveling around Europe during my exchange and missed classes as a consequence. I had a decent hold of the concepts but lacked any practice leading to a B in the course.
Should I address this drop in any way? If yes, what might be a better way to put it across so as to minimize the negative look on my application.