The correct option is
D Onion and mushroom
Let's identify the number of votes for each type of pizza topping:
From the bar graph, we observe:
Tomato topping got 50 votes.
Pepper topping got 100 votes.
Onion topping got 200 votes.
Bacon topping got 100 votes.
Mushroom topping got 150 votes.
So, the onion toppings got the most number of votes, that is, 200 votes.
After onion, mushroom toppings got the highest number of votes, that is, 150 votes.
Hence, the top 2 toppings in order would be onion (200 votes) and mushroom (150 votes).