Select the most appropriate option to improve the bold part of the sentence.
The price of petrol has increased yesterday.

Correct option is B

The most appropriate option to improve the bold part of the sentence is (b) "increased yesterday". 
Explanation:
The original sentence uses the present perfect tense ("has increased"), which is typically used for actions that started in the past and continue into the present. However, the phrase "yesterday" specifies a definite past time. The simple past tense ("increased") is the correct tense to use when referring to an event that happened on a specific day like yesterday. 
Why other options are incorrect:
· (a) rose yesterday: 
While "rose" is the past tense of "rise," it generally refers to ascending or moving upwards physically. In the context of prices, "increased" is the more precise word. 
· (c) has been increased yesterday: 
This option uses the present perfect passive tense ("has been increased"). This tense implies that the price was increased by someone else, which is not necessarily implied in the original sentence. Furthermore, using the passive voice with a specific past time like "yesterday" is awkward. 
· (d) risen yesterday: 
Similar to (a), "risen" is the past tense of "rise" and is not the most appropriate word for price increases.