Assertion : If any piece of DNA is somehow transferred into an alien organism,, most likely, this piece of DNA would not be able to multiple itself in the progeny cells of the organism
Reason :For the multiplication of any alien piece of DNA in an organism it needs to be a part of a chromosome (s) which has a specific sequence known as origin of replication.

Options

A. If both assertion and reason are true and the reason is the correct explanation of the assertion
B. If both assertion and reason are true but reason is not the correct explanation of the assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false

Explanation

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that if a piece of DNA is transferred into an alien organism, it is unlikely that this DNA will replicate in the progeny cells of that organism. This suggests that foreign DNA may not be compatible with the host's cellular machinery.

2. **Understanding the Reason**: The reason provided explains that for any DNA to replicate within an organism, it must be integrated into the organism's chromosomes. Specifically, it needs to have a sequence known as the "origin of replication" (ori site), which is essential for the initiation of DNA replication.

3. **Linking Assertion and Reason**: The assertion aligns with the reason because if the foreign DNA does not integrate into the host's chromosomes or lacks an origin of replication, it cannot be replicated during cell division. Thus, the assertion is supported by the reason.

4. **Evaluating the Truth of Both Statements**: Both the assertion and the reason are true. The assertion correctly identifies the limitation of foreign DNA replication, and the reason accurately describes the necessity of the origin of replication for DNA multiplication.

5. **Conclusion**: Since both the assertion and the reason are true, and the reason provides a correct explanation for the assertion, the answer is that both statements are true, and the reason is the correct explanation of the assertion.

### Final Answer:
Both assertion and reason are true, and the reason is the correct explanation of the assertion.