Which of the following is a function of the cytoskeleton?
a. a cell keep its shape
c. surrounds the cell
b. contains dna
d. make proteins

Option A.

Explanation:

Cytoskeleton is defined as the network of interlinking protein filaments which begins from the cell nucleus to the cell membrane.

The cytoskeleton functions to keep the shape of the cell. There are three main component of cytoskeleton microfilaments, intermediate filaments, and microtubules.

Microfilaments are composed of G-actin proteins with seven nanometers in diameter; Intermediate filaments are made up of keratin twisted around each other that helps in providing shape and are having eight to twelve nanometers; and Microtubules are composed of stronger proteins which helps in forming long, hollow cylinders with twenty-five nanometers.

Hence, the correct option is A.

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the last one: artificial selection/genetic engineering

plant breeding is modifying the genetic composition of the plant - but this isn't cloning (which is specifically introducing a gene into a genome). but you are artificially selecting for the phenotype that you want.

the second one is literally genetic engineering - the gene would have been cloned first and then inserted or genetically engineered into the new plant cell (the cotton).