Final answer:
The true statement about solids and gases is that particles in solids are held together more strongly, allowing solids to maintain a definite shape and volume, in contrast to the free movement of gas particles.
Step-by-step explanation:
The correct statement about solids and gases is c) Particles in solids are held together more strongly. In solids, particles are typically tightly packed in an orderly arrangement, and they have restricted movement, primarily vibrating about a fixed point. In contrast, in gases, particles move freely and are separated by large distances compared to those in solids. Gases must be contained to prevent them from expanding and escaping into the surroundings. This difference is due to the strength of the forces holding the particles together, which are much stronger in solids than in gases.