A main source of fat and saturated fatty acids in children's diets is A. meat B. candy C. whole milk D. french fries

(My answer is D)

The most important consideration when installing playground equipment is A. cost B. height C. finishing materials D. surface materials (My answer is C)
I am not confident about these answers. Please help

I think you're right about the first one -- although children's diets are quite varied.

I'm not sure between C and D on the second one. I'd need to know more about the playground equipment and what exactly is included in finishing materials and surface materials.