What was the Spanish response from 1769 through the 1790s to English e

What was the Spanish response from 1769 through the 1790s to English explorations and Russian fur-trading activities on the Pacific coast?

A) creating a string of Spanish missions, forts, and settlements from San Diego to San Francisco and develop the economy of California
B) concluding a treaty with Russia permitting fur-trading activities across a wide swath of northern California
C) ceding a part of northern California to Great Britain in order to avert war between the two countries
D) Spain declaring war on Great Britain over control of the Pacific Northwest

ANSWER
Answer: A