Question

step 5 one white card one round white card
step 6 one white card one white card
step 7 one purple card one yellow card and one red card
step 8 one blue card stop adding cards
step 9 one red card four red cards
step 10 one green card one yellow card
ali’s row:
green square red circle purple square blue square white circle white square purple square blue square red square green square
prima’s row:
green square green square red square purple square blue square white square white square purple square

1. which statement is one possible explanation why prima’s protein model has fewer cards in it than ali’s protein model?

a. she rolled a 4 before doing step 1.
b. she rolled a 4 before doing step 10.
c. she rolled a 4 before doing step 7.
d. she rolled a 4 before doing step 8.

Explanation:

1. First, count the steps completed by each person: Ali completed all 10 steps (has 10 cards), while Prima only completed 7 steps (has 7 cards), meaning she stopped at Step 8.
2. Step 8's instruction is "stop adding cards", so this is the point where she would halt the process.
3. Evaluate the options: If she rolled a 4 before Step 8, she would follow the Step 8 instruction to stop, which matches her having only 7 cards (completing Steps 1-7, then stopping at Step 8). Other options would result in stopping earlier or completing more steps.

Answer:

D. She rolled a 4 before doing step 8.