Which type of fertilizer contains both nitrogen and phosphorus?

The correct answer is complete fertilizer because a complete fertilizer is specifically defined as one that contains all three primary nutrients essential for plant growth: nitrogen (N), phosphorus (P), and potassium (K). This type of fertilizer is designed to provide a well-rounded nutrient profile to promote healthy plant development.

Understanding the components of fertilizers can clarify why this answer is accurate. Organic fertilizers often contain varying amounts of nutrients but are not guaranteed to include all three primary nutrients. Phosphate fertilizers are specifically formulated to supply phosphorus and may not contain nitrogen or potassium, which narrows their nutrient scope. Inorganic fertilizers can contain specific nutrients but, like organic fertilizers, do not necessarily include all three primary nutrients unless they are labeled as complete. Thus, complete fertilizer is the right choice as it explicitly includes both nitrogen and phosphorus, along with potassium.