Assertion (A): Prototherians are egg laying mammals.
Reason (R): They act as connecting link between reptiles and mammals.

Options

A. Both A and R are true and R is the correct explanation for A.
B. Both A and R are true but R is not the correct explanation for A.
C. A is true and R is false.
D. A is false and R is true.

Explanation

To solve the question regarding the assertion and reason, we can break it down into clear steps:

### Step 1: Analyze the Assertion
- **Assertion (A)** states that "Prototherians are egg-laying mammals."
- This statement is **true**. Prototherians, which include the platypus and echidnas, are indeed the only group of mammals that lay eggs.

### Step 2: Analyze the Reason
- **Reason (R)** states that "They act as connecting links between reptiles and mammals."
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