Consider the given two statements:
| Assertion (A): | Roundworms are considered pseudocoelomates. | 
| Reason (R): | They have a body cavity not lined with mesoderm. | 
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). | 
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). | 
| 3. | (A) is True but (R) is False. | 
| 4. | Both (A) and (R) are False. | 
| I: | having radial symmetry in adults and larvae | 
| II: | having three germ layers | 
| III: | lacking a coelom |