The question examines a teacher's approach in planning lessons by considering students' prior knowledge and selecting suitable learning methods and materials. This process involves understanding the components of a teaching plan. Let's explore each option:

• (a) Assessment strategies: This involves evaluating students' performance and understanding, which is not the primary task described in the question.
• (b) Competencies to be achieved: This relates to the learning outcomes expected, but does not directly involve the selection of teaching materials or methods.
• (c) Pedagogical choices based on student understanding: This involves adapting teaching methods based on students' prior knowledge, which is precisely what the teacher is doing.
• (d) Content and teaching-learning materials' selection: Choosing appropriate learning materials is a fundamental part of the teaching plan as described. This is explicitly mentioned in the question.
• (e) Home assignments: These are for practice and reinforcement, not directly related to the in-class teaching strategy selection.

Conclusion: The teacher is designing a plan based on the understanding of students and choosing suitable learning materials and methods. Therefore, the components reflected in this scenario are:

• (c) Pedagogical choices based on student understanding
• (d) Content and teaching-learning materials' selection

Hence, the correct answer is:

Only (c) and (d)