In context, which version of sentence 4 (reproduced below) most effectively explains why oil palms are "an efficient and lucrative crop," as mentioned in sentence 3

The trees grow year-round, which means their oil can be harvested year-round.

(As it is now)

The trees grow year-round and have the highest yield per acre of any oil seed, thus allowing growers to maximize land usage and produce more saleable product.

Since palm oil has become an increasingly popular commodity, it has also become an increasingly profitable crop to produce and sell.

Palm tree growers can capitalize on year-round palm oil harvests, so it is surprising that palm oil production has only recently seen this rise in popularity.

Palm tree growers avoid the seasonal fluctuations that other growers face, which means they face fewer production obstacles