The diagram illustrates the structure of one chromosome. Which row is the correct one?
- A1: centromere; 2: chromatid; number of DNA strands: 2
- B1: centromere; 2: telomere; number of DNA strands: 4
- C1: chromatid; 2: telomere; number of DNA strands: 2
- D1: telomere; 2: chromatid; number of DNA strands: 4