The four gas giants are

(Planets should be in correct sequence)

A. Jupiter, Saturn, Mars and Neptune

B. Jupiter, Neptune, Saturn, and Uranus

C. Mercury, Jupiter, Mars and Earth

D. Jupiter, Saturn, Uranus, and Neptune

Jupiter, Saturn, Uranus, and Neptune

D. Jupiter, Saturn, Uranus, and Neptune

All the outer planets are gas giants; the outer planets start with Jupiter because it is after the asteroid belt.

Just remember the saying:

My Very Elegant Mother Just Served Us Nine Pizzas

This corresponds to the order of the planets:

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Pluto