—¿qué estabas haciendo cuando te
a. cortabas, estaba afeitándome.
b. cortaste, me estaba afeitando.
c. cortabas, me estaba afeitando.
d. caías, me afeitaba.

The answer is B. cortaste, Me estaba afeitando.
Those are the only logical answers to plug into the blanks. After plugging those words in, the full question asks "Que estabas haciendo cuando te cortaste?" which in English is "What were you doing when you cut yourself?" Then the answer in Spanish reads "Me estaba afeitando." Which in English translates to '''I was shaving". Therefore B is the only correct answer.

I’ll you it’s very easy, 12 is good, 13 is the first , 14 first too, 15 is good , 16 is the second one