Identifying a breeding approach — selecting a naturally occurring variant with desirable traits and crossing it repeatedly is an example of:

Introduction / Context:
Crop improvement can occur by conventional breeding or by direct genetic manipulation. Recognizing which process matches a described scenario is fundamental in agricultural biotechnology education.

Given Data / Assumptions:

• A naturally occurring variant is identified in a population.
• This variant is selectively bred (crossed/selected) to fix the trait.
• No direct gene transfer or targeted mutagenesis is stated.

Concept / Approach:

Traditional plant breeding relies on phenotypic selection and hybridization among existing germplasm. Transgenic methods introduce DNA across species or constructs; mutant selection typically follows induced mutagenesis; genome editing applies precise nucleases. None of these are implied in the scenario.

Step-by-Step Solution:

Verification / Alternative check:

Plant breeding textbooks define mass selection and pedigree selection of natural variants as conventional breeding.

Why Other Options Are Wrong:

Transgenic tech and genome editing involve direct DNA manipulation; mutant selection typically follows induced mutagenesis, which is not stated.

Common Pitfalls:

Assuming any “improved plant” is transgenic; conventional breeding has produced most of the world’s crop varieties historically.

Final Answer:

Traditional plant breeding (selection and crossing)