(1) around 5000 B.C.E., the first animals were domesticated and tamed. (2) donkeys and oxen were used to carry heavy loads and pull sledges. what is the best way to combine sentences 1 and 2?

a. around 5000 B.C.E., the first animals were domesticated and tamed, especially donkeys and oxen, used to carry heavy loads and pull sledges.
b. around 5000 B.C.E., the first animals were domesticated and tamed; especially donkeys and oxen, which were used to carry heavy loads and pull sledges.
c. around 5000 B.C.E., the first animals were domesticated and tamed, especially, donkeys and oxen which were used to carry heavy loads and pull sledges.
d. around 5000 B.C.E., the first animals were domesticated and tamed, especially donkeys and oxen, which were used to carry heavy loads and pull sledges.

i got d as the answer, is it right?

Either D or A -- but I think D is better.

Be sure you write with capital letters in the right places. If you wrote any of these sentences in my classes, they'd all be marked incorrect!

The best way to combine sentences 1 and 2 is:

d. around 5000 B.C.E., the first animals were domesticated and tamed, especially donkeys and oxen, which were used to carry heavy loads and pull sledges.

This option combines the two sentences while maintaining clarity and coherence. It uses appropriate punctuation with commas and includes the relative pronoun "which" to connect the animals (donkeys and oxen) to their role in carrying heavy loads and pulling sledges.