A word equation to find the number of oranges packed in each crate can be expressed as:

(Number of Oranges) × (Weight per Orange) + (Weight of Empty Crate) = Total Weight of Crate

A) Number of Oranges × 0.29 lb + 4.3 lb = 47.8 lb
B) Number of Oranges × 4.3 lb + 0.29 lb = 47.8 lb
C) Number of Oranges × 0.29 lb - 4.3 lb = 47.8 lb
D) Number of Oranges × 4.3 lb - 0.29 lb = 47.8 lb