When a child reaches adolescence, there is apt to be a conflict between the parents and the child, since the latter considers himself to be by now quite capable of managing his own affairs, while the former are filled with parental solicitude, which is often a disguise for love of power. Parents consider, usually, that the various moral problems which arise in adolescence are peculiarly their province. The options they express, however, are so dogmatic that the young seldom confide in them, and usually go their own way in secret.

Based on the above passage, the following assumptions have been made:

1. The adolescent does not feel comfortable with his parents because they tend to be dominating and assertive.

2. The adolescent of modern times does not have much respect for parents.

Which of the assumptions given above is/are valid?

The correct option is 1 only.

To determine the validity of the assumptions, we can break down the text step-by-step:
1. Evaluating Assumption 1: The passage states that parental solicitude is "often a disguise for love of power." A "love of power" directly implies a dominating attitude. Additionally, the passage mentions that the opinions parents express are "so dogmatic that the young seldom confide in them, and usually go their own way in secret." The term "dogmatic" describes an assertive, opinionated, and inflexible nature. Since the youth do not confide in them and hide their actions, it shows they do not feel comfortable with their parents due to this dominating and assertive behavior. Thus, Assumption 1 is valid.
2. Evaluating Assumption 2: The text explains the root causes of conflict (the child's desire for independence versus parental control and dogmatism). However, it does not mention or imply that adolescents of "modern times" lack respect for their parents. It is a generalization not supported by any specific evidence in the passage. Thus, Assumption 2 is invalid.

Consequently, only Assumption 1 is a valid assumption based on the passage.