If Sol offer La his car for P500,000 for seven (7) days to accept the offer, and La paid P5,000 prior giving his answer to Sol:

1. Can Sol withdraw the offer even before the lapse of seven days?

2. What is the P5,000 for and why did La paid Sol this amount?

3. When will the offer to La be ineffective?

4. In the absence of any consideration or promise from La, La has not accepted the offer of Sol three, four, five days, has passed. Can Sol withdraw the offer to La?