Answer:
The letter was calm and restrained.
Explanation:
Tension between the United States and Russia, formerly known as the Union of Soviet Socialists States were on the rise. From the rocket race, to the missiles race, the tensions between the two countries kept escalating. In the wake of the events, one of the potentially dangerous events was the Cuban missile crisis. Russia thought to build a missile base in Cuba. This would present a great danger to the US. In the letter, Kennedy is tentative in his approach. He exercises restraint. In fact, in one of the lines he says, "...I recognize Mr. Chairman, that it was not I who issued the first challenge in this case..." The president distances himself from the provocations that had been sent his his predecessors.
The answer to your question would be the following one:
Cambridge dictionary defines "prevalent" as "existing very common or happening often". As regards "widespread", it states that it means "existing or happening in many places and/or among many people".
With respect to "requisite", Cambridge dictionary states that it is an adjective which means "necessary or needed for a particular purpose". As you can see, "necessary" is part of the definition of "requisite".
Finally, "propagate" is defined as "to spread opinions, lies, or beliefs among a lot of people". As you can see, "spread" is part of the definition of "propagate".
Prevalent: Widespread
Requisite: Necessary
Propagate: Spread
D) They are built by the deposition of sand by wind
Answer:
The underlined phrase is Adjectival
Explination:
It describes the bond they had/it describes the bond.
