The correct option is
B Started breathig in and in.
In order to answer the given question, let's read the passage. As we understand, the frog wants to be as big as an ox. The second sentence of the passage states- 'So it began to breathe in and in every time it swallowed more air, it did, in fact, become bigger.' By this sentence, we understand that he started breathing more air to become bigger. Let's have a look at the options now.
Option B - The frog swallowed more air, it didn't 'shook its head'. Hence, option B is incorrect.
Option C - The passage doesn't mention anything about frog's friend. In order to become bigger, the frog began breathing more air, it didn't look at the friends. Hence, option C is incorrect.
Option D - The frog wanted to make others happy by becoming as big as an ox. To become big, he swallowed more air, he didn't make others happy. Hence, option D is incorrect.
Option A - Yes, he started breathing in and in and swallowed more air to become bigger. Hence option A is correct.