Select the most appropriate option to fill in the blank

Select the most appropriate option to fill in the blank.

When my mother was going to the market she_______to a old friend who used to study with her in the same school.

a)            Go across

b)            Went across

c)            Come across

d)            Came across

‘come across’ is a prepositional phrase which means ‘to meet by chance’ and the given sentence is in past tense so we need to use past form of the verb come, that is option d ‘came across’.