Question

what are their plans write the correct alternative to complete the sentences

Answer 1

Answer:

Here, 'had seen' in past perfect tense is correct because it is used to indicate a completed action of the past that happened before another event took place. Here, 'last night' indicates a past action.

'Saw' in simple past is incorrect because it indicates a completed action and when two actions happen in the past the one which happens first will be in the past perfect tense, hence option 'A' is incorrect 

'Has seen' in present perfect tense is incorrect because it is used to indicate an action completed in the immediate past which has relation with the present time. 

'Was seen' is incorrect for the given sentence ).