Select the most appropriate option to fill in blank number 1.
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. causes.
The word "causes" is used in the past tense, which is suitable in the context of the sentence.
Here, 'cause' means 'a thing that gives rise to an action, phenomenon, or condition.'
The other options, "thoughts," "things," or "types" do not fit the context.