Why did europeans look for sea route to asia in the 15th century

choose all that are correct

a. the ottoman turks control the silk road which was the main land route from europe through the middle east to asia

b. demand in europe for asian spices silk and other goods had grown considerably

c. explorers were looking for a way to sail around asia to get to the americas

d. traveling overland from europe to asia was extremely difficult and hazardous