Use the scenario to answer the question.
A weather forecast predicts that a sunny week will be followed by a rainy weekend.
Which pressure systems are likely to occur?
A) first a high-pressure system, and the another high-pressure system
B) first a high-pressure system, and then a low-pressure system
C) first a low-pressure system, and then a high-pressure system
D) first a low-pressure system, and then another low-pressure system