Which sentence best compares Lewis and Clark's expedition with Zebulon Pike's expedition?
1. Pike's expedition failed to gather useful information, while Lewis and Clark's expedition was a success.
2. Both expeditions took place without President Thomas Jefferson's permission and caused conflicts with Spain.
3. Both expeditions provided the United States valuable information about the trans-Mississippi west.
4. Pike led a scientific expedition, while Lewis and Clark's expedition was mainly for military purposes.