Answer:
d) Was named Leningrad during Soviet times.
Step-by-step explanation:
St petersburg is easily the second most important city in Russia, and has always been the second most important city, it´s not the capital of Russia, Moscow is and has always been a competitor with the capital, during soviet times St Petersburg was called Leningrade in honor to Lenin, its located in the Baltic Sea, so the only one that is true is d) Was named Leningrad during Soviet times. and that is the correct answer.