A4.0 w led bulb produces 240 lumens. what is the efficacy of the bulb? 1. 1.7 lm/w 2. 60 lm/w 3. 236 lm/w 4. 244 lm/w

Explanation:

i guess that visual aids present persuasive examples to what you are presenting, some factors would be theme (does it fit with the color, information, what you are presenting), size (can you see it, is it a big enough span of data/information), and overall look of the visual aid.

hope this : )