Oil rose slightly early Tuesday, fluctuating as investors show cautious optimism about an end to the conflict in the Middle East. International benchmark Brent crude futures for August gained 0.36% to $78.18 a barrel. U.S. West Texas Intermediate futures for August added 0.45% to $74.19 per barrel. The price of the commodity fell overnight after the U.S. Treasury issued a 60-day license that authorizes the production, delivery and sale of oil from Iran. It allows the importation of Iranian