A strawberry farmer's crop has been devastated by a fungal infection. The farmer searches for any fungi-resistant strawberry plants in his fields, but finds none. Why? Due to vegetative reproduction, his plants are not genetically diverse. Due to sexual reproduction, his plants are not genetically diverse. Due to sexual reproduction, his plants are genetically diverse. Due to vegetative reproduction, his plants are genetically diverse.

Due to vegetative reproduction, his plants are not genetically diverse.

Explanation:

Strawberry plants do not reproduce via sexual reproduction, so we can immediately eliminate the options pertaining to sexual reproduction. Now, we can take a look at the options pertaining to vegetative reproduction.

With vegetative reproduction, the "child" plant has the same genetic makeup as the parent plant. If this happens over and over, then the offspring will not be genetically diverse. Either all of the strawberry plants or none of them would be fungi-resistant. The farmer did not find any fungi-resistant plants because they all have the same genes, and therefore all do not have the genes that would make them fungi-resistant.