To understand the characteristics of conventional learning, let's analyze the options provided in the context of traditional education systems. Conventional learning is characterized by specific features and methods. Here's a breakdown of the options:

• Cost-effective: While some traditional educational systems can be cost-effective, this is not a defining characteristic of conventional learning.
• Teacher-centered learning: Conventional learning is primarily teacher-centered, where the teacher is the main source of information and authority in the classroom.
• Learner oriented: This characteristic is more associated with modern or progressive educational approaches rather than conventional learning.
• Prescribed curriculum: Traditional education usually follows a fixed, prescribed curriculum. This is a hallmark of conventional learning systems.
• Require regular attendance: In conventional learning environments, attending classes regularly is generally mandatory and forms a crucial part of the learning process.

Given these explanations, the correct option is B, D, and E only, which corresponds to:

• B. Teacher-centered learning
• D. Prescribed curriculum
• E. Require regular attendance

Conclusion: B, D, and E accurately reflect the characteristics of conventional learning. Therefore, the correct answer is B, D, and E only.