Question 979Navigation General

You are correct, the answer is A) A tropical storm. A tropical storm is characterized by closed isobars, a counter-clockwise rotary circulation, and sustained winds between 34 and 63 knots (39 to 73 mph). This fits the description provided in the question. The other options are incorrect because: B) A hurricane has sustained winds of 64 knots (74 mph) or greater, C) A tropical depression has sustained winds less than 34 knots, and D) A tropical disturbance is an unorganized area of thunderstorms without a well-defined circulation.