17) A

1 – Correct
If the off does not divide then the organism cannot form.

2 – Wrong
There is no use of sperm cells

3 – Correct
If the implantation fails, then the cloning will obviously fail

4 – Wrong
The egg must divide and not differentiate

5 – Correct
If the enucleated egg and the transferred nucleus are not compatible, then the cloning will not take place

Statements 1, 3 and 5 are correct so A is the answer.