The correct answer is option 1: Positively Phototropic.

Stem is generally positively phototropic, which means it grows towards light. Phototropism is a plant`s response to light, where the stem grows towards the light source to maximize photosynthesis. This characteristic allows the plant to position its leaves for maximum exposure to sunlight.

Option 2, Negatively Phototropic, is incorrect because stems do not grow away from light sources.

Option 3, Negatively Geotropic, is also incorrect because geotropism refers to the plant`s response to gravity, affecting the growth direction of roots, not stems.

Option 4, Positively Acrotropic, is not relevant as there is no such term in relation to stem growth.

Therefore, the correct answer remains option 1: Positively Phototropic.