Which spacecraft provided the first close-up pictures of Jupiter and Saturn?

The option that is correct is the Pioneers, specifically Pioneer 10 and Pioneer 11. Pioneer 10 was the first spacecraft to travel through the asteroid belt and make its flyby of Jupiter in 1973, providing humanity with its first close-up images and data about the gas giant. Following this, Pioneer 11 became the first spacecraft to make a flyby of Saturn in 1979, filling in our knowledge and providing detailed information about the planet’s rings and moons.

While the Voyagers were indeed significant in the exploration of both Jupiter and Saturn, conducting their flybys a few years later and sending back incredibly detailed images and data, the initial close-up photographs were obtained by the Pioneer missions. Mariners were primarily focused on Mars and Venus, and the Vikings were dedicated to Mars missions, which is why they do not pertain to the exploration of Jupiter and Saturn.