PLEASE HELP RIGHT NOW. Read the sentence. Which transition best completes the sentence? therefore The engineers believed that the roller coaster was safe to ride again; they decided to keep it closed until further test trials could be completed. O as a result O because O however

It's d (however)

Explanation:

Everyone else is wrong. Got it right on edge, also sorry I'm late

the present continuous is a verb tense which is mainly used to indicates that an action is in progress at the moment of speaking.  

it is formed using: person + verb to be (am/is/are) +verb + - ing form  

example: i am studying at this moment .

in addition, the present continuous is also used in order to express things that will or will not happen in the near future.

example: i am having dinner with some friends tonight.

the speaker sometimes   uses it   to express that an action is repeated and it causes irritation on the part of the speaker

example: my sister is constantly complaining about everything.

the answer is allusion. give me brainliest