Question

what effect does composting have on household waste streams?
composting produces rich mulch for gardens.
composting raises awareness about levels of household waste.
home composting reduces materials for municipal recycling.
composting can reduce the amount of a households trash.

Explanation:

Composting involves decomposing organic waste. When households compost, organic materials that would otherwise be trash (like food scraps) are diverted. This directly reduces the volume of trash a household generates. While producing mulch (A) is a benefit, it's about the use of compost rather than its effect on waste streams. Raising awareness (B) is more of an indirect or side - effect. Home composting doesn't necessarily reduce materials for municipal recycling (C) as compostable materials are often not part of traditional municipal recycling streams (which focus more on plastics, metals, etc.).

Answer:

Composting can reduce the amount of a household's trash.