The given question presents an assertion (A) and a reason (R) related to the possibility of fusing two ice cubes by pressing them together.

Option 1 states that both the assertion and the reason are true. Additionally, it claims that the reason provides the correct explanation for the assertion. This means that both pressing two ice cubes together to fuse them and the fact that pressure affects the melting point of a solid are accurate statements. The reason explains why applying pressure to the ice cubes causes them to melt and fuse together. Therefore, option 1 is the correct answer.

Option 2 suggests that both the assertion and the reason are true. However, it argues that the reason is not the correct explanation for the assertion. This contradicts the given information, as the reason does provide an accurate explanation for the possibility of fusing the ice cubes. Therefore, option 2 is incorrect.

Option 3 implies that the assertion is true, but the reason is false. Since the given statement explains how applying pressure affects the melting point of solids, option 3 is incorrect.

Option 4 states that the assertion is false, but the reason is true. However, the given information supports the possibility of fusing two ice cubes by applying pressure. Therefore, option 4 is