The correct option is A 170
Last week, the height of the sunflower was 1 m and 30 cm.
Here, 'and' signifies addition.
∴ Last week height =1 m+30 cm
Over the past week, the height increased by 40 cm.
∴ Current height =1 m+30 cm+40 cm
To perform addition, let's make all the terms as like-terms.
We know, 1 m=100 cm
⇒ 1 m+30 cm+40 cm=100 cm+30 cm+40 cm=(100+30+40) cm=170 cm
Hence, the current height is 170 cm.