1. (10 points) Now, two people are to be selected from four individuals: A, B, C, and D, to participate in an activity. The rules are: If A goes, then B also goes; If C does not go, then B does not go; If C goes, then D does not go. The two people who finally go to participate in the activity are ( )
A. A, B
B. B, C
C. A, C
D. B, D
【Analysis】(1) According to if A goes, then B also goes, it can be deduced that if A is present, B must also be present; (2) Also, according to if C does not go, then B does not go, it can be deduced that if B goes, C must also go. The only way to satisfy both (1) and (2) and "if C goes, then D does not go" is for B and C to participate in the activity, as follows.

【Solution】Solution: According to if A goes, then B also goes, it can be deduced that if A is present, B must also be present. Also, according to if C does not go, then B does not go, it can be deduced that if B goes, C must also go. If C goes, then D does not go, it can be deduced that if C does not go, then D goes, and at the same time, B does not go. According to "if A goes, then B also goes," it can be deduced that A does not go, which means only D goes, contradicting the requirement that two people participate in the activity. The only way to satisfy all conditions is for B and C to participate in the activity.

Hence, the answer is: $B$.