The correct answer is true.
It is true that Charles V was the king of Spain who sent the Spanish Armada to England.
King Charles V gave the order to invade Great Britain in 1588. At that time his name was Philip II of Spain. The reason was simple. Britain had changed its religion from Catholicism to Protestantism, disobeying the pope.
The correct answer to the second question is false.
Frederick William was not the first king of Prussia. The first king of Prussia was King Albert in 1490, followed by his son Albert Frederick in 1553. Frederick William became King of Prussia until 1620.