Embryonic cell count via division events over 4 days Steps:

• Total duration: 4 days × 24 hours/day = 96 hours.
• Number of divisions: 96 hours ÷ 2 hours/division = 48 divisions.
• Cells produced: each mitosis yields 2 daughter cells, so 48 × 2 = 96 cells.
• This assumes maximum divisions with each producing 2 cells independently.

Why B is correct:

• Matches the formula: total cells = 2 × (total hours ÷ division interval) = 2 × (96 ÷ 2) = 96, based on each mitosis producing two cells.

Why the others are wrong:

• A: Counts only the 48 divisions, ignoring the 2 cells per division.
• C: Doubles the correct total (96 × 2 = 192), perhaps miscounting days or intervals.
• D: Quadruples the correct total (96 × 4 = 384), likely overestimating divisions or cells per division.

Final answer: B