**Category:** Genetics  
**Subtype:** Inheritance and Phenotype Expression  
**Problem Description:** Determine the genotype that results in the phenotype of tall stems and red flowers.  

**Key Information:**  
- Allele \(A\) (tall) is completely dominant over allele \(a\) (short).  
- Allele \(B\) (red flowers) is completely dominant over allele \(b\) (white flowers).  

**Options to Evaluate:**  
- A. Aabb (tall, white flowers)  
- B. AaBb (tall, red flowers)  
- C. aaBB (short, red flowers)  
- D. aaBb (short, white flowers)  

**Goal:** Identify which genotype leads to both tall stems and red flowers.