I'm not sure what the question is here but the first one is correct.
Están haciendo un viaje de dos semanas
Theres only one dog so the answer is C. Hay el perro negro. , i hoped this helped
Tengo
tienes
tienes
tiene
Here is a little tip:
Yo(I) Tengo
Tu(You) Tienes
El/Ella(He/She) Tiene
Any verb for "Yo" ends in "o", "Tu" with "es"(with some exceptions), and "el/ella" with "e"(again, with some exceptions)
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hope it helps