Your answer to your question is D ;)
yes, and it should be still called the White House lawn.
That's because the island was invaded by pretty much everyone even though it was originally a French colony. British and Spanish armies also intervened and every time that the people would win and take control of the island, the French would just send numerous new soldiers to retake it. Just during Napoleon's era, 50 000+ soldiers died from yellow fever only.
People are saying by 2050, it will happen. There are already 41 million Spanish speakers in the U.S. 321.4 Million Beings in the U.S itself. So, if you do the math, we have 12.76% of the U.S population being Spanish speakers. By the rates, I don't think its gonna happen by 2050, so maybe around 2075 - 2100 (Unless there is a serious exponential growth.