Question:
Doctors have speculated that the body's own estrogen protects against cell damage and improves blood flow.
Their belief was based on speculation that estrogen prevents cell damage and improves blood flow.
Answer:
4

Question:
A boy and a girl playing on the beach.
A dog playing in the waves with a ball.
Answer:
1

Question:
Negotiators said Friday they made good progress during their latest round of talks on creating a Central American Free Trade Agreement.
Negotiators said Friday they made progress during their latest round of free-trade negotiations between the United States and five Central American countries this week in Houston.
Answer:
4