The events of the paragraph happened in the past.
Past tense expresses an action or situation that was started and finished in the past. Most past tense verbs end in “-ed”. The irregular verbs have special past tense forms which must be memorized, like "left" is the past form of leave. For example – Last night, I finished my entire holidays homework.
The passive voice of past tense uses the past form of verbs.
'Shook' is the simple past form of 'shake' while 'shaken' is the past participle of 'shake'.
Option B here is incorrect because past participles require helping verbs. Here 'was' is missing.
Option D is wrong form of past tense, therefore incorrect.
Option C is incorrect here, as the sentence requires use of passive voice therefore past participle form should be used.
Option A is the correct answer.