It's D second because the reason before the says "One is that..."
Scannable resumes are a brief account of a person’s education, qualifications, and previous experience, that can be scanned electronically into an employer's database.
Hope this helps
Hey there!
The present tense would be swim.
This is because it suggests your swimming in the present, instead of swum or swam, which suggests that you did these 50 laps in the past.
Hope this helps!
