Answer:
WAIS-IV
Step-by-step explanation:
If Brian is 25 years old, the most appropriate intelligence test for him to complete would be the WAIS-IV. The WAIS-IV is specifically designed to assess the intelligence of adults and is appropriate for individuals aged 16 to 90 years. The WPPSI-III and WISC-IV are designed for younger age groups and would not be appropriate for Brian. The SB5 is a general intelligence test that can be used for individuals of all ages, but the WAIS-IV is still the most appropriate choice for Brian given his age and developmental level.