Final answer:
Marco will achieve sharp images by using a E.)small aperture, which increases the depth of field and brings more of the image into focus. A slow shutter speed would risk motion blur, and color saturation does not directly affect sharpness.
Step-by-step explanation:
The option that would result in sharp images for Marco is E. Small aperture. A small aperture reduces the amount of light entering the camera but increases the depth of field, ensuring that more of the image is in focus. When using a larger aperture, you get a narrower depth of field, which can make the background blurrier, as seen in sports action photos. In contrast, a slow shutter speed would not contribute to sharper images, as it can lead to motion blur unless the camera and subject are completely still. A high saturation of colors or dull colors has no direct effect on the sharpness of images.
A slower shutter speed might be used in low-light situations or when aiming to capture motion blur for artistic effect, such as smoothing water movement in a waterfall. A faster shutter speed is used to freeze action, like capturing a sharp image of a fast-moving athlete. The resulting depth of field when using a wide-open aperture is narrow, making it ideal for isolating the subject from the background. In contrast, using a small aperture provides a greater depth of field, with more of the scene in focus from front to back, which is preferable for landscape photography or any situation where you want the majority of the image sharp.