⇒⇒  Simple present

a) Jane and Mark were in the beach.  ⇔  simple past

b)  Yesterday I slept at 10:00.  ⇔  simple past

c)  We study English on Thursdays.  ⇔    simple present

Alternativa correta letra 'c'

Explicação:

were   >>  passado do verbo 'to be'  >>  estavam / estiveram

slept   >>   passado do verbo 'to sleep' >>  dormi

yesterday  >>  ontem

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